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If 3 `Cot Theta = 4 , "Write the Value Of" ((2 Cos Theta - Sin Theta))/(( 4 Cos Theta - Sin Theta))` - Mathematics

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If 3 `cot theta = 4 , "write the value of" ((2 cos theta - sin theta))/(( 4 cos theta - sin theta))`

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W e have , 

 3 `cot theta = 4 `

 ⇒ ` cot theta = 4/3 `

 Now, 

       `((2 cos theta + sin theta ))/((4 cos theta - sin theta))`

      =` (((2 cos theta )/ sin theta + sin theta / sin theta))/(((4 cos theta) / sin theta - sin theta/ sin theta))`          (ЁЭР╖ЁЭСЦЁЭСгЁЭСЦЁЭССЁЭСЦЁЭСЫЁЭСФ ЁЭСЫЁЭСвЁЭСЪЁЭСТЁЭСЯЁЭСОЁЭСбЁЭСЬЁЭСЯ ЁЭСОЁЭСЫЁЭСС ЁЭССЁЭСТЁЭСЫЁЭСЬЁЭСЪЁЭСЦЁЭСЫЁЭСОЁЭСбЁЭСЬЁЭСЯ ЁЭСПЁЭСж sin ЁЭЬГ)

      =`((2 cot theta +1))/((4 cot theta -1))`

       =`((2xx4/3 +1))/((4xx4/3-1))`

       =`((8/3+1/1))/((16/3-1/1))`

       =`(((8+3)/3))/(((16-3)/3))`

       =`((11/3))/((13/3))`

       =`11/13`

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рдЕрдзреНрдпрд╛рдп 8: Trigonometric Identities - Exercises 3

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рдЖрд░.рдПрд╕. рдЕрдЧреНрд░рд╡рд╛рд▓ Mathematics [English] Class 10
рдЕрдзреНрдпрд╛рдп 8 Trigonometric Identities
Exercises 3 | Q 21

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Prove that `\frac{\sin \theta -\cos \theta }{\sin \theta +\cos \theta }+\frac{\sin\theta +\cos \theta }{\sin \theta -\cos \theta }=\frac{2}{2\sin^{2}\theta -1}`


Prove the following trigonometric identities.

`tan A/(1 + tan^2  A)^2 + cot A/((1 + cot^2 A)) = sin A  cos A`


Prove the following trigonometric identities.

`cot^2 A cosec^2B - cot^2 B cosec^2 A = cot^2 A - cot^2 B`


Prove the following identities:

cosecA – cosec2 A = cot4 A + cot2 A


Prove the following identities:

`(1 - 2sin^2A)^2/(cos^4A - sin^4A) = 2cos^2A - 1`


`sqrt((1-cos theta)/(1+cos theta)) = (cosec  theta - cot  theta)`


` (sin theta + cos theta )/(sin theta - cos theta ) + ( sin theta - cos theta )/( sin theta + cos theta) = 2/ ((1- 2 cos^2 theta))`


Prove that `( sintheta - 2 sin ^3 theta ) = ( 2 cos ^3 theta - cos theta) tan theta`


If tan A = n tan B and sin A = m sin B , prove that  `cos^2 A = ((m^2-1))/((n^2 - 1))`


Prove that:

`"tanθ"/("secθ"  –  1) = (tanθ + secθ + 1)/(tanθ + secθ - 1)`


If x = a sin θ and y = b cos θ, what is the value of b2x2 + a2y2?


The value of sin2 29° + sin2 61° is


If sinA + cosA = `sqrt(2)` , prove that sinAcosA = `1/2`


Find the value of sin 30° + cos 60°.


Prove that `sqrt((1 + sin A)/(1 - sin A))` = sec A + tan A. 


Prove that cosec2 (90° - θ) + cot2 (90° - θ) = 1 + 2 tan2 θ.


The value of sin2θ + `1/(1 + tan^2 theta)` is equal to 


Prove that cot2θ × sec2θ = cot2θ + 1


sin4A – cos4A = 1 – 2cos2A. For proof of this complete the activity given below.

Activity:

L.H.S = `square`

 = (sin2A + cos2A) `(square)`

= `1 (square)`       .....`[sin^2"A" + square = 1]`

= `square` – cos2A    .....[sin2A = 1 – cos2A]

= `square`

= R.H.S


sin(45° + θ) – cos(45° – θ) is equal to ______.


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