The elimination of θ from x cosθ-y sinθ=2 and x sinθ + ycosθ = 4 will give

For any real value of $${\sqrt {secθ-1}\over \sqrt {secθ+1} }=?$$

Find the value of sec θ − tan θ, if sec θ + tan θ = $$ \sqrt { 5} $$

What is the value of the expression?

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

If cos(2θ+54°) = sinθ, 0°<(2θ-54°)<90°, then what is the value of $$1\over tan5θ+cosec{5θ\over 2}$$   

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

what is the value of the expression
 cos 2A cos2B+sin²(A-B)-sin²(A+B)?

$${1+sinθ}\over cosθ $$ is equal to which of the following (where $$θ ≠ {π\over2} $$