English

Find D Y D X Y = ( Sin X ) Cos X + ( Cos X ) Sin X ? - Mathematics

Advertisements
Advertisements

Question

Find  \[\frac{dy}{dx}\]  \[y = \left( \sin x \right)^{\cos x} + \left( \cos x \right)^{\sin x}\] ?

 

Advertisements

Solution

\[\text{ We have, y  }= \left( \sin x \right)^{\cos x } + \left( \cos x \right)^{\sin x} \]
\[ \Rightarrow y = e^{\log \left( \sin x \right)^{\cos x }} + e^{\log \left( \cos x \right)^{\sin x }}\]
\[ \Rightarrow y = e^{\cos x \log\sin x} + e^{\sin x logcos x} \]
\[\text{ Differentiating with respect to x }, \]
\[\frac{dy}{dx} = \frac{d}{dx}\left( e^{\cos x \log\sin x} \right) + \frac{d}{dx}\left( e^{\sin x logcos x} \right)\]

\[ = e^{\cos x \log\sin x } \frac{d}{dx}\left( \cos x \log\sin x \right) + e^{ \sin x logcos x } \frac{d}{dx}\left( \sin x logcos x \right) \]

 \[ = e^{\log \left(\sin x \right)^{\cos x}} \left[ \cos x\frac{d}{dx}\log\sin x + \log\sin x\frac{d}{dx}\left( \cos x \right) \right] + e^{\log \left(\cos x \right)^{\sin x}} \left[ \sin x\frac{d}{dx}\log\cos x + \log\cos x\frac{d}{dx}\left( \sin x \right) \right] \]\[ = \left( \sin x \right)^{\cos x} \left[ \cos x\frac{1}{\sin x}\frac{d}{dx}\left( \sin x \right) + \log\sin x \times \left( - \sin x \right) \right] + \left( \cos x \right)^{\sin x} \left[ \sin x\frac{1}{\cos x}\frac{d}{dx}\left( \cos x \right) + \log\cos x \times \left( \cos x \right) \right]\]

\[ = \left( \sin x \right)^{\cos x } \left[ \cot x \cos x - \sin x \log\sin x \right] + \left( \cos x \right)^{\sin x } \left[ \tan x\left( - \sin x \right) + \cos x \log\cos x \right]\]
\[ = \left( \sin x \right)^{\cos x} \left[ \cot x \cos x - \sin x \log\sin x \right] + \left( \cos x \right)^{\sin x} \left[ \cos x \log\cos x - \sin x \tan x \right]\]

shaalaa.com
  Is there an error in this question or solution?
Chapter 11: Differentiation - Exercise 11.05 [Page 89]

APPEARS IN

RD Sharma Mathematics [English] Class 12
Chapter 11 Differentiation
Exercise 11.05 | Q 26 | Page 89

Video TutorialsVIEW ALL [1]

RELATED QUESTIONS

Differentiate etan x ?


Differentiate \[\sqrt{\frac{a^2 - x^2}{a^2 + x^2}}\] ?


Differentiate \[\sqrt{\frac{1 + \sin x}{1 - \sin x}}\] ?


Differentiate  \[e^x \log \sin 2x\] ?


Differentiate \[\frac{x^2 \left( 1 - x^2 \right)}{\cos 2x}\] ?


If  \[y = \log \sqrt{\frac{1 + \tan x}{1 - \tan x}}\]  prove that \[\frac{dy}{dx} = \sec 2x\] ?


If  \[y = \left( x - 1 \right) \log \left( x - 1 \right) - \left( x + 1 \right) \log \left( x + 1 \right)\] , prove that \[\frac{dy}{dc} = \log \left( \frac{x - 1}{1 + x} \right)\] ?


If \[y = \sqrt{a^2 - x^2}\] prove that  \[y\frac{dy}{dx} + x = 0\] ?


Differentiate  \[\sin^{- 1} \left\{ \sqrt{\frac{1 - x}{2}} \right\}, 0 < x < 1\]  ?


Differentiate \[\tan^{- 1} \left( \frac{4x}{1 - 4 x^2} \right), - \frac{1}{2} < x < \frac{1}{2}\] ?


Differentiate \[\sin^{- 1} \left( \frac{1}{\sqrt{1 + x^2}} \right)\] ?


Differentiate \[\tan^{- 1} \left( \frac{a + x}{1 - ax} \right)\] ?


Differentiate \[\tan^{- 1} \left( \frac{x}{1 + 6 x^2} \right)\] ?


Find  \[\frac{dy}{dx}\] in the following case \[e^{x - y} = \log \left( \frac{x}{y} \right)\] ?

 


If \[y = x \sin \left( a + y \right)\] ,Prove that \[\frac{dy}{dx} = \frac{\sin^2 \left( a + y \right)}{\sin \left( a + y \right) - y \cos \left( a + y \right)}\] ?


Differentiate \[e^{x \log x}\] ?


Differentiate \[\left( \sin^{- 1} x \right)^x\] ?


Differentiate \[x^\left( \sin x - \cos x \right) + \frac{x^2 - 1}{x^2 + 1}\] ?


If \[x^x + y^x = 1\], prove that \[\frac{dy}{dx} = - \left\{ \frac{x^x \left( 1 + \log x \right) + y^x \cdot \log y}{x \cdot y^\left( x - 1 \right)} \right\}\] ?


Find \[\frac{dy}{dx}\] when \[x = \frac{2 t}{1 + t^2} \text{ and } y = \frac{1 - t^2}{1 + t^2}\] ?


\[\sin x = \frac{2t}{1 + t^2}, \tan y = \frac{2t}{1 - t^2}, \text { find }  \frac{dy}{dx}\] ?

Differentiate  \[\sin^{- 1} \sqrt{1 - x^2}\] with respect to \[\cos^{- 1} x, \text { if}\] \[x \in \left( - 1, 0 \right)\] ?


If \[f\left( 1 \right) = 4, f'\left( 1 \right) = 2\] find the value of the derivative of  \[\log \left( f\left( e^x \right) \right)\] w.r. to x at the point x = 0 ?

 


If \[y = \sin^{- 1} x + \cos^{- 1} x\] ,find \[\frac{dy}{dx}\] ?


If \[x = a \left( \theta + \sin \theta \right), y = a \left( 1 + \cos \theta \right), \text{ find} \frac{dy}{dx}\] ?


If \[y = \log \sqrt{\tan x}, \text{ write } \frac{dy}{dx} \] ?


If \[3 \sin \left( xy \right) + 4 \cos \left( xy \right) = 5, \text { then } \frac{dy}{dx} =\] _____________ .


If \[y = \log \sqrt{\tan x}\] then the value of \[\frac{dy}{dx}\text { at }x = \frac{\pi}{4}\] is given by __________ .


If \[y = \sqrt{\sin x + y}, \text { then }\frac{dy}{dx} \text { equals }\] ______________ .


If x = a (1 − cos3θ), y = a sin3θ, prove that \[\frac{d^2 y}{d x^2} = \frac{32}{27a} \text { at } \theta = \frac{\pi}{6}\]?


If y = ex (sin + cos x) prove that \[\frac{d^2 y}{d x^2} - 2\frac{dy}{dx} + 2y = 0\] ?


If  \[y = e^{a \cos^{- 1}} x\] ,prove that \[\left( 1 - x^2 \right)\frac{d^2 y}{d x^2} - x\frac{dy}{dx} - a^2 y = 0\] ?


If y = 500 e7x + 600 e−7x, show that \[\frac{d^2 y}{d x^2} = 49y\] ?


If y log (1 + cos x), prove that \[\frac{d^3 y}{d x^3} + \frac{d^2 y}{d x^2} \cdot \frac{dy}{dx} = 0\] ?


\[\text { If x } = a \sin t - b \cos t, y = a \cos t + b \sin t, \text { prove that } \frac{d^2 y}{d x^2} = - \frac{x^2 + y^2}{y^3} \] ?


If y = a xn + 1 + bxn and \[x^2 \frac{d^2 y}{d x^2} = \lambda y\]  then write the value of λ ?


If y = a + bx2, a, b arbitrary constants, then

 


If y = a cos (loge x) + b sin (loge x), then x2 y2 + xy1 =


\[\text { If } y = \left( x + \sqrt{1 + x^2} \right)^n , \text { then show that }\]

\[\left( 1 + x^2 \right)\frac{d^2 y}{d x^2} + x\frac{dy}{dx} = n^2 y .\]


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×