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cosα * tgα = cosα * sinα/cosα =sinα
d)
sinα *1/tgα = sinα * cosα/sinα = cosα
e)
sinα * tg(90 - α) = sinα * ctgα = sinα * cosα/sinα = cosα
f)
tgα *tg(90 - α) = tgα * ctgα = tgα * 1/tgα = 1