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 $$ {tan^2{3A}}+{cot^{4}3A}$$.

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

If $$ {1+sinθ\over {1-sinθ}}={p^{2}\over{q^{2}}}$$, then sec θ is equal to:

If tan $$ -{7π\over4}=x $$ then the value of x is : 

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

The value of $$ {2(1-sin^{2}θ)}+{2(1-cos^{2}θ)}$$. 

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