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8.1 Integration by Parts
 (fg)' = f'g + gf'
 ∫udv = ∫udv + dvu  vdu

Inverse Trig Functions:
Things to know.
 sin^{2}x + cos^{2}x = 1
 sin^{2}x = 1/2  1/2cos^{2}x
 sin(2x) = 2sinxcosx
 d/dx cos^{1}x = 1/(1x)^{1/2}
 cos^{2}x = 1/2 + 1/2cos2x
 cos2x = cos^{2}x  sin^{2}x
 d/dx cos^{1}x = 1/(1x)^{1/2}

More Inverse Funtions
 tan^{2}+ 1 = sec^{2}x
 d/dx tan^{2}x = sec^{2}x
 d/dx tan^{1}x = 1/(1+x^{2})
 d/dx ln(x^{2}+1) = 1/(x^{2}+1) * 2x

Inverse Trig Functions
 sec^{2}x = tan^{2}x + 1
 d/dx secx = secxtanx
 d/dx sin^{1}x = 1/(1x^{2})^{1/2}
 d/dx sec^{1}x = 1/(x(x^{2}1)^{1/2})
 d/dx tan^{1}x = 1/(1+x^{2})

