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

If x+ y=90°, then what is  the value of $$ {\sqrt{cosx.cosecy-cosx.siny}}$$?

What is the value of $${\sqrt{1-cosA\over{1+cosA}}}$$?

$$ {3sin60°-4sin^{3}60°=?}$$

If is a positive acute angle and 5 cosθ + 12 sinθ = 13, then find the value of cosθ?

(sec A + tan A – 1) (sec A – tan A+1) =?

What is the simplification value of $${cotA+tanB}\over{cotB+tanA}$$?

If $${secθ+tanθ\over secθ-tanθ}=2{51\over79}$$, then the value of sinθ is equal to: