Trig Substitutions

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4 Terms

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x=asinθ, root(a²-x²)=acosθ, 1-sinθ=cosθ

2
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x=atanθ, root(x²+a²)=asecθ, sec²θ-1=tan²θ

3
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x=asecθ, root(x²-a²)=atanθ, sec²θ-1=tan²θ

4
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tan sec identity

sec²θ=1+tan²θ