рдорд░рд╛рдареА

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

Advertisements
Advertisements

рдкреНрд░рд╢реНрди

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

Advertisements

рдЙрддреНрддрд░

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`

shaalaa.com
  рдпрд╛ рдкреНрд░рд╢реНрдирд╛рдд рдХрд┐рдВрд╡рд╛ рдЙрддреНрддрд░рд╛рдд рдХрд╛рд╣реА рддреНрд░реБрдЯреА рдЖрд╣реЗ рдХрд╛?
рдкрд╛рда 13: Trigonometric identities - Exercises 3

APPEARS IN

рд╕рдВрдмрдВрдзрд┐рдд рдкреНрд░рд╢реНтАНрди

Prove the following trigonometric identity.

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


If 3 sin θ + 5 cos θ = 5, prove that 5 sin θ – 3 cos θ = ± 3.


Prove the following identities:

`(secA - tanA)/(secA + tanA) = 1 - 2secAtanA + 2tan^2A`


Prove the following identities:

`(1 + cosA)/(1 - cosA) = tan^2A/(secA - 1)^2`


If x = a cos θ and y = b cot θ, show that:

`a^2/x^2 - b^2/y^2 = 1` 


If` (sec theta + tan theta)= m and ( sec theta - tan theta ) = n ,` show that mn =1


If `sec theta + tan theta = p,` prove that

(i)`sec theta = 1/2 ( p+1/p)   (ii) tan theta = 1/2 ( p- 1/p) (iii) sin theta = (p^2 -1)/(p^2+1)`


Prove that:

`(sin^2θ)/(cosθ) + cosθ = secθ`


If sin θ = `11/61`, find the values of cos θ using trigonometric identity.


sec4 A − sec2 A is equal to


Prove the following identity : 

`sqrt((1 + cosA)/(1 - cosA)) = cosecA + cotA`


Without using trigonometric table , evaluate : 

`(sin49^circ/sin41^circ)^2 + (cos41^circ/sin49^circ)^2`


Without using trigonometric identity , show that :

`sin(50^circ + θ) - cos(40^circ - θ) = 0`


Choose the correct alternative:

1 + tan2 θ = ?


Find the value of ( sin2 33° + sin2 57°).


Prove that:
`sqrt(( secθ - 1)/(secθ + 1)) + sqrt((secθ + 1)/(secθ - 1)) = 2 "cosec"θ`


Prove that: 2(sin6 θ + cos6 θ) – 3 (sin4 θ + cos4 θ) + 1 = 0.


Prove that: `(sec θ - tan θ)/(sec θ + tan θ ) = 1 - 2 sec θ.tan θ + 2 tan^2θ`


Prove that sin6A + cos6A = 1 – 3sin2A . cos2A.


Prove the following:

`sintheta/(1 + cos theta) + (1 + cos theta)/sintheta` = 2cosecθ


Share
Notifications

Englishрд╣рд┐рдВрджреАрдорд░рд╛рдареА


      Forgot password?
Use app×