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" IS "cosec A+2cosec2A=sec A*cot(A)/(2)...

" IS "cosec A+2cosec2A=sec A*cot(A)/(2)

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cosec A- 2cot 2A cos A=

cosec A -2 cot 2A cos A=

Prove that : (sec A - tan A)/ (cosec A + cot A) = (cosec A - cot A)/ (sec A + tan A)

" (1) sec^(2)A+cosec^(2)A=sec^(2)A*cosec^(2)A

S=cosecx+cosec 2x+cosec 4x+…+cosec 2nx=cot(x/2)−cot2nx

tan A + cot A = 2 cosec 2A

Prove that : (sin A - cos A) (1 + tan A + cot A) = (sec A)/ (cosec^(2) A) - (cosec A)/ (sec^(2) A)

(tan A+cot A)=(sec A*csc A)

" (i) "(1+sec A+tan A)(1-cosec A+cot A)=2

( cos A - sin A + 1 ) / ( cos A + sin A - 1 ) = cosec A + cot A cosec A + cot A , = using the identity cosec ^ 2 A = 1 + cot^ 2 A .