Question

1/2 -sin^2 7π/12 solve

Answer 1

I hope it will help you

Answer 2

Que) 1/2 - sin^2 7pi/12

Answer; -√3/4 :)

Soln => 2*1/2 - 2*sin^2 (7pi/12)

2

=> 1- 2sin^2(7pi/12)

2

=> Cos(2*7pi/12) ===> (Cos2A= 1-2sin^2A)

2

=> Cos (7pi/6 *180/pi)

2

=> Cos(210°)/2

=> Cos(180+30)/2

=> -cos 30°/2

=> -√3/4

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