рд╣рд┐рдВрджреА

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
  рдХреНрдпрд╛ рдЗрд╕ рдкреНрд░рд╢реНрди рдпрд╛ рдЙрддреНрддрд░ рдореЗрдВ рдХреЛрдИ рддреНрд░реБрдЯрд┐ рд╣реИ?
рдЕрдзреНрдпрд╛рдп 13: Trigonometric identities - Exercises 3

APPEARS IN

рдЖрд░.рдПрд╕. рдЕрдЧреНрд░рд╡рд╛рд▓ Mathematics [English] Class 10
рдЕрдзреНрдпрд╛рдп 13 Trigonometric identities
Exercises 3 | Q 21

рд╕рдВрдмрдВрдзрд┐рдд рдкреНрд░рд╢реНрди

Prove the following trigonometric identities.

sec A (1 − sin A) (sec A + tan A) = 1


Prove the following trigonometric identities.

tan2 θ − sin2 θ = tan2 θ sin2 θ


Prove the following trigonometric identities

cosec6θ = cot6θ + 3 cot2θ cosec2θ + 1


Prove the following trigonometric identities.

(cosec θ − sec θ) (cot θ − tan θ) = (cosec θ + sec θ) ( sec θ cosec θ − 2)


Prove the following identities:

`1/(1 - sinA) + 1/(1 + sinA) = 2sec^2A`


If x cos A + y sin A = m and x sin A – y cos A = n, then prove that : x2 + y2 = m2 + n2


If sec A + tan A = p, show that:

`sin A = (p^2 - 1)/(p^2 + 1)`


If `( cosec theta + cot theta ) =m and ( cosec theta - cot theta ) = n, ` show that mn = 1.


If `cos theta = 7/25 , "write the value of" ( tan theta + cot theta).`


Write True' or False' and justify your answer the following: 

\[ \cos \theta = \frac{a^2 + b^2}{2ab}\]where a and b are two distinct numbers such that ab > 0.


If x = a sec θ and y = b tan θ, then b2x2 − a2y2 =


If a cos θ + b sin θ = 4 and a sin θ − b sin θ = 3, then a2 + b2


Prove the following identity : 

`sin^4A + cos^4A = 1 - 2sin^2Acos^2A`


Without using trigonometric table , evaluate : 

`cos90^circ + sin30^circ tan45^circ cos^2 45^circ`


Find the value of sin 30° + cos 60°.


Find A if tan 2A = cot (A-24°).


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


Prove that : `tan"A"/(1 - cot"A") + cot"A"/(1 - tan"A") = sec"A".cosec"A" + 1`.


a cot θ + b cosec θ = p and b cot θ + a cosec θ = q then p2 – q2 is equal to


Prove that `(1 + sec theta - tan theta)/(1 + sec theta + tan theta) = (1 - sin theta)/cos theta`


Share
Notifications

Englishрд╣рд┐рдВрджреАрдорд░рд╛рдареА


      Forgot password?
Use app×