Evaluate: sec2 18° - cot2 72°.
1
2
3
4
Evaluate: cos40° cosec50° + sin50° sec40°
0
Evaluate: sin 15° cos 75° + cos 15° sin 75°.
Find the value of x, if sin2x = 2 sin 45° cos 45°
0°
30°
45°
90°
Evaluate: cos240° + cos250°.
cosec A
tan A
sec A
cot A
cosec θ - 1
cosec θ + 1
cosec θ
sec θ + 1