book Maths Puzzle Numerical Ability

how would you do that if the power is outside of the ( ). for example (2+15)
and then the power would be on the top.

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book Other Question

If anglesA,B, and C are the sides of a triangle such that sin(A+B)=1/cos(C) and cos(A+B)=cos(C), then show that the triangle is a right triangle I need to convert the following into an excel formula and I don't remember where to start. Can you help?

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