if sinQ=1/2 find (3cosQ – 4cos³Q)
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Answer:
sin ϕ = 1/2 ϕ = 30°
Substituting this value of θ in LHS
LHS= 3 cos 30°- 4 cos³ 30°
= 3(√3/2) - 4(√3/2)³
= 3√3/2- 3√3/2
= 0
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