book Maths Puzzle Numerical Ability

csc^4x-2csc^2x+1=cot^4x
How do u verify the identity?

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book Other Question

The smaller of two pipes takes 5 hours longer to fill a tank. If both pipes are used, the job can be done in 3 1/3 hours. How long will it take each pipe to fill the tank alone? 5(y+2)= 17