exam Maths Puzzle Numerical Ability

-3-(7)/3-5 is the question. i am haveing trouble with the positive and negative. when you add and subtract and when it becomes multiplacation

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exam Other Question

Prove that:
1 + cos A/ 1 - cos A = tanČA/(secA - 1)Č
Assume that all variables are positive and multiply:
y^3/6 (y^-3/6 + 7y^3/6)