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

If tanθ=1/5 then the value of Cosec²θ=?

If Tan⁴x – Tan²x=1 then the value of Sin⁴x + Sin²x is__

$$ {3tan^{2}30°}-{4\over 3}{sin^{2}60°}- {1\over2}{cosec^{2}45°}+{4\over3}{sin^{2}90°=?}$$

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 $$ sin(θ+30^0)= {3\over \sqrt { 12} }  $$ then find cos²θ : 

If cosec θ=1.25 then $$ {4 \ tanθ-5 \ cosθ + 1\over secθ+ 4cotθ-1}=?$$

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