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√(a2 - x2 )
x = asin(θ)
1 - sin2 (θ) = cos2 (θ)
√(a2 + x2 )
x = atan(θ)
1 + tan2 (θ) = sec2 (θ)
√(x2 - a2 )
x = asec(θ)
sec2 (θ) -1 = tan2 (θ)
∫ sin(x)cos(x)
sin(x) is odd
u = cos(x), du = -sin(x)dx
Use sin(x) = 1 - cos2 (x) = 1 - u2
∫ sin(x)cos(x)
cos(x) is odd
u = sin(x), du = cos(x)dx
Use cos(x) = 1- sin2 (x) = 1 - u2
∫ sin(x)cos(x)
Both are even
sin2 (x) = ½ (1 - cos(2x))
cos2 (x) = ½ (1 + cos(2x))
∫ sec(x)tan(x)
tan(x) is odd
u = sec(x), du = sec(x)tan(x)dx
Use tan2 (x) = sec2 (x) - 1 = (u2 - 1)
∫ sec(x)tan(x)
sec(x) is odd
u = tan(x), du = sec2 (x)
Use sec2 (x) = 1 + tan2 (x)