Solve secx - cotx = cscx - tanx
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Solve 1+1+2/(1-tan²x )-(3-tan²x)/(1-3 tan²x )=0
Prove that：tan-11/3+tan-11/5+tan-11/7+tan-11/8=45°
Prove that：(sin75°+sin15°)/(sin75°-sin15°)=tan60°
Transform the difference of two squares into a rectangle, the ratio of two sides being 2 : 3.
Evaluate to four significant figure by logarithm,
Simplify yz(x+a)/(x-y)(x-z)+zx(y+a)/(y-z)(y-x)+xy(z+a)/(z-x)(z-y)