I know it was very easy, but i forgot how to do it
these are the problems.
tan θ = cot(45+2θ)
sinθ = cos(2θ-10)
sec θ = csc (θ/2 + 20)
cos θ = sin(3θ + 10)
sin (3θ-15) = cos (θ+25)
cot (θ-10) = tan (2θ+20)
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co-functions
sin θ = cos(90-θ)
cos θ = sin(90-θ)
tan θ = cot(90-θ)
cot θ = tan(90-θ)
sec θ = csc(90-θ)
csc θ = sec(90-θ)
................................................
tan θ = cot(45+2θ) = cot(90-θ)
45+2θ = 90-θ
θ = 15