Please can anyone help me with these questions? Thank you

Subject:MathPrice: Bought3

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Please can anyone help me with these questions? Thank you.

1) Find the value of tanθ when tan2θ is:

a)(-20/21)

b)(36/77)

2) Solve these equations, giving values of θ from 0 to 360 inclusive.

a)cot2θ+5cosθ=2

b)2sec2x-cot2x=tan2x

c)2tan(θ/2)+3tanθ=0?