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Sin x
f'(x) = Cosx -(-SinxSinx - CosxCosx)
(Sinx)²
= Cosx + Sin²x + Cos²x
(Sinx)²
f'(π/3) = Cosπ/3 + 1
(sinπ/3)²
= 1/2 + 1/(1/2 √3)²
= 1/2 + 1/(3/4)
= 1/2 + 4/3
= 3/6 + 8/6
= 11/6