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Prove that ("sin"theta)/(1-"cot"theta)+(...

Prove that `("sin"theta)/(1-"cot"theta)+("cos"theta)/(1-"tan"theta)="cos"theta+"sin"theta`

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Prove that sin(2theta)/(1-cos2theta)=cot theta

Prove that : ("cosec"theta-"sin"theta)("sec"theta-"cos"theta)("tan"theta+"cot"theta)=1

Prove the identity ("sin"theta+"cos"theta)("tan"theta+"cot"theta)="sec"theta+"cosec"theta

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ICSE-MATHEMATICS- 2015-SECTION- B
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