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Question		Answer
sin(pi/2 +-α) start learning		cos a
sin(pi - a) start learning		sin a
sin(pi + a) start learning		-sin a
cos(pi/2 - a) start learning		sin a
cos(pi/2 + a) start learning		-sin a
cos(pi + - a) start learning		-cos a
tg(pi - a) start learning		-tg a
tg(pi + a) start learning		tg a
sin(-a) start learning		-sin a
cos(-a) start learning		cos a
tg(-a) start learning		-tg a
ctg(-a) start learning		-ctg a

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