61.
The value of tan10°. tan15°. tan75°. tan80° is?

62.
If sin7x = cos11x, then the value of tan9x + cot9x is?

63.
The value of $$\left( {{{\sin }^2}7{{\frac{1}{2}}^ \circ } + {{\sin }^2}82{{\frac{1}{2}}^ \circ }} \right)$$     is?

64.
The value of sin265° + sin225° + cos235° + cos255° is?

65.
ABCD is a rectangle of which AC is a diagonal. The value of (tan2 ∠CAD + 1)sin2 ∠BAC is?

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