1/2 -sin^2 7π/12 solve
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value of cos^2 15 is
(√3 +1/2√2)^2
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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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