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

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

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

The greatest value of $$ Sin^{4}θ+Cos^{4}θ $$ is:

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

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

If $${secθ+tanθ\over secθ-tanθ}={5\over 3}$$ then sinθ is equal to ;

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