exam Maths Puzzle Numerical Ability

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

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help verifying the identity

sin^2(theta/2)=csc(theta)-cot(theta)/2csc theta a CD costs $3.50 more than a tape. Write an expression for the total cost of 1 CD and 1 tape.