Упростите выражения: сos(2п-t) sin(3п/2+t) сtg(270-a)

Question

Упростите выражения:
сos(2п-t)
sin(3п/2+t)
сtg(270-a)

Comments

cost

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-sint

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-cosa

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а последнее?

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aa that was ctg:)

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last one is tga

Answer 1

сos(2п-t)= Сos t
sin(3п/2+t) = - Sint
сtg(270-a) = tg t