51.
If sinα .sec(30° + α) = 1, (0 < α < 60°), then the value of sinα + cos2α is?

52.
If ∠A and ∠B are complementary to each other, then the value of sec2A + sec2B - sec2A.sec2B is?

53.
The value of cotθ.tan(90° - θ) - sec(90° - θ)cosecθ + (sin225° + sin265°) + $$\sqrt 3 $$ (tan5°. tan15°. tan30°. tan75°. tan85°)

54.
If cosθ.cosec23° = 1, the value of θ is?

55.
If A, B and C be the angles of a triangle, the incorrect relation is ?

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