exam Maths Puzzle Numerical Ability

3 radical 25 over 4

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Hey,
Could you please help me with the following Binomial theorem expansion question?

The first three terms in the expansion of (1+ay)^n are 1, 12y, and 68y^2. Evaluate a and n
P(-15/17,-8/17) is found on the unit circle. Find sin θ and cos θ.

Thank You