prove that cotA - tanA =2cos^2A -1 / sinAcosA
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COT A - TAN A= COS A/SIN A- SIN A /COS A
=COS²-SIN²A/SIN A COS A
=COS²A-(1-COS²A)/SIN A COS A
=COS²A-1+COS²A/SIN A COS A
=2COS²A - 1/ SIN A COS A
=COS²-SIN²A/SIN A COS A
=COS²A-(1-COS²A)/SIN A COS A
=COS²A-1+COS²A/SIN A COS A
=2COS²A - 1/ SIN A COS A
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