Во вложении..............

Question

Во вложении..............

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Comments

под б проверь,может не 13?

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там под б пи/3 а не на 13

Answer 1

А)4sin330=4sin(360-30)=-4sin30=-4*1/2=-2
b)(2cosπ/4*cosπ/6)/cos(π/3-π/12)=(2cosπ/4*cosπ/6)/cosπ/4=
=2cosπ/6=2*√3/2=√3