Question

Evaluate cos thetha into cosec (90-thetha

Answer 1

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Answer 2

Hi !

To find :- cosθ.cosec(90° - θ)

we know that ,
cosec(90° - θ) = secθ                [ complementary angles ]

hence , replacing cosec(90° - θ) by secθ 

cosθ.cosec(90° - θ) = cosθ.secθ  

we know that ,

cosθ.secθ   = 1                             [ secθ = /1 cosθ ] 
 
 therefore  ,
 
                 cosθ.cosec(90° - θ) = cosθ.secθ   = 1