.5(x-sin(x)cos(x))+c
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-cotan(x)
6,561 (i solved it by using this sentence: (9x9) x (9x9)= 81x81=6,561
the integral of the square-root of (x-1)2 = x2/2 - x + C
(x+sinxcosx)/2, can do it by parts or by knowing your double angle formulas
Cosine squared theta = 1 + Sine squared theta