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Cos (A-A) cot (1 + A) cos (-A)
Z COSA
tan Cata) tan ish &A) sin 125-A)​

1 thought on “$<br />Cos (A-A) cot (1 + A) cos (-A)<br />Z COSA<br />tan Cata) tan ish &A) sin 125-A)​”

1. Answer:

   tan

   2

   2

   α

   cot

   −1

   (

   cosα

   )−tan

   −1

   (

   cosα

   )=x

   2

   π

   −tan

   −1

   (

   cosα

   )−tan

   −1

   (

   cosα

   )=x (because cot

   −1

   x+tan

   −1

   x=

   2

   π

   )

   ⇒

   2

   π

   −2tan

   −1

   (

   cosα

   )=x

   ⇒sinx=sin(

   2

   π

   −2tan

   −1

   (

   cosα

   ))

   Let’s say tan

   −1

   (

   cosα

   )=θ

   ⇒tanθ=

   cosα

   sinx=sin(

   2

   π

   −2θ)=cos2θ

   =

   1+tan

   2

   θ

   1−tan

   2

   θ

   =

   1+cosα

   1−cosα

   sinx=

   1+cosα

   1−cosα

   =

   2cos

   2

   α/2

   2sin

   2

   α/2

   ⇒sinx=tan

   2

   2

   α

   .

   Step-by-step explanation:

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