121.

If  and , then the value of x²y² (x² + y² + 3) is

• 0

• 1

• 2

• 3

The least value of (4 sec²θ +  9 cosec²θ) is

• 1

• 19

• 25

• 7

If  and  then the value of x² + 4y² is

• 1

• 2

• 3

• 4

If  then the value of cos (75° - θ) is

• 

• 

• 

• 1

If  and  then the value of  is

If sin (x + y) = cos {3 (x + y)}, then the value of tan {2(x + y)} is

• 1

• 0

• 

• 

The value of 
(1 + sec 20° + cot 70°) (1 - cosec 20° + tan 70°) is

• -1

• 2

• 1

• 0

If x sin³θ + y cos³θ = sin θ cos θ ≠ 0
and x sin θ  - y cos θ = 0,   then the value of (x² + y²) is

• sin θ - cos θ

• sin θ + cos θ

• 0

• 1

If  then the value of  is

• 4

• 6

• 0

• 1

If sec θ - cosec θ = 0,  then the value of (sec θ + cosec θ)

• 

• 0

• 

•