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Debsta Q1 Rewrite so you get sin2x/cos2x = 1/sqrt(3).
Let 2x = A and solve for A
Then put 2x back in and solve for x
Don't forget to consider the domain.
Q2 Let x/2 =A, write as cosA = 1, solve for A, sub in x/2 and solve for x. Again, watch the domain.