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start learning

Question		Answer
sin(-α) = start learning		-sin α
cos(-α) start learning		cos α
tg(-α) start learning		-tg α
ctg(-α) start learning		-ctg α
f_tryg(360-α) sin(360-α); cos(360-α) start learning		f_tryg(-α) sin(-α); cos α
f_tryg(n*360+α) n € C sin(720+45) start learning		f_tryg α sin(45)
sin(180-α) = start learning		sin α
cos(180-α) start learning		-cos α
tg(180-α) start learning		-tg α
ctg(180-α) start learning		-ctg α
sin(180+α) start learning		-sin α
cos(180+α) start learning		-cos α
tg(180+α) start learning		tg α
ctg(180+α) start learning		ctg α

Trigonometric reduction formulas