If 0 ≤ θ ≤ 90⁰ and 4cos²θ - $$4{\sqrt { 3} \ }cosθ$$ + 3 = 0, then the value of θ is : 

If sin3θ=cos(20° - θ) then find out  the value of θ.

If sec -5π/4 = x, then  the value   of x is

Find the value of $$\left({1\over {sin 60°}} \right)^{2} + (cos 30°)^{2} \over(tan 45°)^{2}$$.

The value of $$ sec{^4}A(1-sin{^4}A)-2tan{^2}A $$ is:

If $$ {cot A={n\over{n+1}}}$$ and $$ {cot B={1\over{2n+1}}}$$ then what is the value of cot (A + B)?

If 2sinθ+ 15 cos²θ=7, 0°˂θ˂90°, then what is the value of $$ {3-tanθ\over 2+tanθ}$$?

Find the value of $$ {\sqrt{(cos^{2}20°+cos^{2}70°)}}$$