exam Maths Puzzle Numerical Ability

Can you answer this problem for me? It is so long, and I just keep getting stuck. It has to do with the trigonometric identities. The instructions are to verify the identity. Here

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how would i do this? Combine the following fractions by addition or subtraction as directed

3 over a+2 + 4 over 2-a - 6 over asq. - 4 The Dalton Art Fund must raise $2500 next year by investing $30,000 in federal notes paying 9% and in muncipal bonds paying 8%. The tresauer ants to invest as much as possible in t