Question

cos(30-A)-cos(30+A)=sinA

Answer 1

,,hey
here is Ur answer

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cos(30-A) - cos(30+A) =sinA
using cos(90-Q) =sinQ

sin (30-A)+ sin(30+A) =sinA

Answer 2

Hi ,

LHS = cos(30-A ) - cos(30+A )

= cos30cosA + sin30sinA

- ( cos30cosA - sin30sinA )

= cos30cosA + sin30sinA

- cos30cosA + sin30sinA

= 2sin30sinA

= 2 × ( 1/2 ) sinA

= SinA

= RHS

I hope this helps you.

: )