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x=asinθ, root(a²-x²)=acosθ, 1-sinθ=cosθ
x=atanθ, root(x²+a²)=asecθ, sec²θ-1=tan²θ
x=asecθ, root(x²-a²)=atanθ, sec²θ-1=tan²θ
tan sec identity
sec²θ=1+tan²θ