exam Maths Puzzle Numerical Ability

help verifying the identity

sin^2(theta/2)=csc(theta)-cot(theta)/2csc theta

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exam Other Question

Rationalize the denominator:

sqrt 2 minus 4 over z^2 plus 2 over z^4
Tower engineering copr. is considering undertaking several proposed projects for the next fiscal yearThe projects the Number of engineers and the number of support people required