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

If 4sin² θ – 1 = 0 and angle θ is less than 90⁰. The value of cos² θ + tan² θ is:
(Take 0⁰ < θ < 90⁰) 

$$ {tan^2θ}$$ is equal to:-

The value of $$ cos {20^o} cos {40^o}cos {60^o}cos {80^o}$$ is:

If $$ {tan3A=cot{(2A+40)}}$$ then find the value of $$ {tan^2{3A}}+{cot^{4}3A}$$.

One angle of a triangle is 55°. If the other two angles are in the ratio 9:16, find the angles?

The value of $$ {(sec^{2}θ+tanθ\cotθ-tan^{2}θ)}$$

If $${(2cos^3 A-cosA)\over (sin A- 2 sin^3 A)=1}$$ then what is the value of A?