is equal to

8

is equal to

9

The value of (1 + cot θ − cosec θ) (1 + tan θ + sec θ) is

11

(cosec θ − sin θ) (sec θ − cos θ) (tan θ + cot θ) is equal

12

If x = a cos θ and y = b sin θ, then b²x² + a²y² =