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May I as what is a safe mark for 3 unit maths so scaling can be in your favour?

[sin(A + 1)(x) + 2sinA(x) + sin(A - 1)(x)] / [cos(n-1)(x) - cos(A + 1)(x) - cos(A + 1)(x) = cot(x/2) I have no idea how to do it.

I had trouble with these questions, some are probably easy but i can't do it. Any help will be appreciated :) These are questions are from 3unit fitzpatrick, exercises 21(c) 47. sin2x + sin4x + sin6x = 4cosxcos2xsin3x 49. sin^2(5x) - sin^(3x) = sin8xsin2x 51. cos35 + cos45 + cos75+ cos85 =...