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

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

Evaluate the following.

sin 25° sin 65° – cos 25° cos 65°.

If 2sinθ+cosθ= $${7\over3}$$ then the value of (tan²θ-sec²θ) is

If sin A=$${6\over 7}$$, then what is the value of sec A?

if (1+sinα) (1-sinβ) (1+sinγ)= (1-sinα) (1-sinβ) (1-sinγ)=?

What is the value of $${tanθ−secθ+1\over tanθ+secθ-1}$$

The numerical value of $$ {1\over 1+cot2}+{3\over 1+tan^2θ}+2sin^2θ$$ will be