Question

Помогите пожалуйста!
А17

Answer 1

$cosdfrac{2 pi x}{3}sindfrac{pi x}{6}=1+sindfrac{2 pi x}{3} cos dfrac{pi x}{6} \ cosdfrac{2 pi x}{3}sindfrac{pi x}{6}-sindfrac{2 pi x}{3} cos dfrac{pi x}{6}=1\ sindfrac{pi x}{2}=-1\ dfrac{pi x}{2}=-dfrac{pi }{2}+2 pi k\ boxed{x=-1+4k; k in Z}$

Answer 2

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