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csc(x)*cos^2(x)+sin(x)=csc(x)
**
Start with left side:
csc(x)*cos^2(x)+sin(x)
=csc(x)(1-sin^2x)+sin(x)
=cscx-cscxsin^2x+sinx
=cscx-(1/sinx)*sin^2x+sinx
=cscx-sinx+sinx
=cscx
verified:
left side=right side