46.
The value of cot 10°.cot 20°.cot 60°.cot 70°.cot 80° is?

47.
The value of cot 18° $$\left( {{\text{cot 7}}{{\text{2}}^ \circ }{\text{.co}}{{\text{s}}^2}{{22}^ \circ } + \frac{1}{{{\text{tan 7}}{{\text{2}}^ \circ }.{\text{se}}{{\text{c}}^2}{{68}^ \circ }}}} \right)$$      is?

48.
If x, y are acute angles, 0 < x + y < 90° and sin(2x - 20°) = cos(2y + 20°), then the value of tan(x + y) is?

49.
sin25° + sin26° + ............. sin284° + sin285° = ?

50.
sin25° + sin210° + sin215° + ...... sin285° + sin290° is equal to?

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