book Maths Puzzle Numerical Ability

please help me solve this question 3x^0 divided by y^-3

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Collect like terms and then arrange in descending order for the variable m.
3m to the power of 4-5m to the power of 6-2m to the power of 4+6m to the power of 6 If Cos A = 3/5 and A is in the first quadrant, find cos 2A.