tan theta -cot theta /sin theta cos theta=tan ²theta -cos ²theta
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tan -cot/sincos =tan^-cos^
sin/cos-cos/sin/sincos=tan^-cos^
sin^-cos^/sincos/sincos =sin^/cos^-cos^/sin^
sin^-cos^=sin^-cos^
sin/cos-cos/sin/sincos=tan^-cos^
sin^-cos^/sincos/sincos =sin^/cos^-cos^/sin^
sin^-cos^=sin^-cos^
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