Find the value of sin (1920°)

if $${secA={5\over 4}}$$, then the value of $${{tanA}\over 1+tan^2A}-{sinA\over secA}$$ is

If a cot θ + b cosec θ= p and b cot θ + a cosec θ = q then p² -q² is equal to _____

$${sin^2θ\over cosθ(1+cosθ)}+{1+cosθ\over cosθ} =?$$

If p = cosec θ – cot θ and q = (cosec θ + cot θ)^-1 then which one of the following is correct?

What is the value of the expression?

(tan0° tan1° tan2° tan3° tan4° …… tan89°)

(sinθ+cosecθ)²+(cos θ+ sec θ)²=?

If x = a secθ cos∅, y = b secθ sin∅, z=c tanθ, then the value of $$ {x^2\over a^2}+{y^2\over b^2}-{z^2\over c^2} $$