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Question		Answer
cos(A-B) start learning		cosAcosB+sinAsinB
cos(A+B) start learning		cos (A + B)
cos(a-B) start learning		cos(A)cos(B)+sin(A)sin(B)
cos(A+B) start learning		cos(A)cos(B)-sin(A)sin(B)
sin(A+B) start learning		cos(B)sin(A)+cos(A)sin(B)
sin(A-B) start learning		cos(B)sin(A)-cos(A)sin(B)
tg(A+B) start learning		[tg(A)+tg(B)]/[-tg(A)*tg(B)+1]
tg(A-B) start learning		[tg(A)-tg(B)]/[tg(A)*tg(B)+1]
ctg(A+B) start learning		[ctg(A)*ctg(B)-1]/[ctg(B)+ctg(A)]
ctg(A-B) start learning		[ctg(A)*ctg(B)+1]/[ctg(B)-ctg(A)]
sin(2A) start learning		2sin(A)cos(A)
cos(2A) start learning		cos^2(A)-sin^2(A)

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