If  with , then the value of  is

• 1

• 0

• 2

• 2

If in a triangle ABC, sinA = cosB then the value of cos C is

• 

• 0

• 1

• 1

23.

If  the value of  is (where ):

• 0

• 

• 2

• 2

The value of  is

If  the value of  is

If  then the value of   is

If  and , then  is equal to

• ab

• 
• 
• 

If x tan 60° + cos 45° = sec 45° then the value of (x² + 1) is

x, y be two acute angles, x + y < 90° and sin (2x - 20°) = cos (2y + 20°), the value of tan (x + y) is

• 
• 

• 1

• 1

If a²sec²x - b²tan²x = c² then the value of (sec²x + tan²x) is equal to (assume b² ≠ a²)