If sec -5π/4 = x, then  the value   of x is

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

If  $$ {cosAcotA \over( 1 - sinA ) }=x $$ then the value of x is : 

If $$ {secθ+tanθ\over secθ - tanθ} $$= $$ 2{51\over 79} $$ sinθ then the value of sin θ is :

If Cos A + Cos² A = 1, then Sin² A + Sin⁴ A=?

If $$ {cot A={n\over{n+1}}}$$ and $$ {cot B={1\over{2n+1}}}$$ then what is the value of cot (A + B)?

The value of sec⁴ A (1 – sin⁴A) – 2tan²A is: 

If a(tanθ+cotθ)=1, sinθ+cosθ=b and 0°<θ<90°, then the relation between a and b.