71. If sec(4x - 50°) = cosec(50° - x), then the value of x is?
72. If $$\pi \sin \theta = 1,$$ $$\pi \cos \theta = 1{\text{,}}$$ then the value of $$\left\{ {\sqrt 3 \tan \left( {\frac{2}{3}\theta } \right) + 1} \right\}$$ is?
73. If in a triangle ABC, sinA = cosB then the value of cosC is?
74. If sinθ × cosθ = $$\frac{1}{2}{\text{,}}$$ Then the value of sinθ - cosθ is where 0° < θ < 90°.
75. The value of cos220° + cos270° = ?
76. If $$\frac{{\cos \theta }}{{1 - \sin \theta }}$$ + $$\frac{{\cos \theta }}{{1 + {\text{sin }}\theta }}$$ = 4, then the value of $$\theta \left( {{0^ \circ } < \theta < {{90}^ \circ }} \right)$$ is?
77. If sec15θ = cosec15θ (0° < θ < 10°) then the value of θ is?
78. If tanθ = tan30° .tan60° and θ is an acute angle, then 2θ is equal to?
79. If 7sin2θ + 3cos2θ = 4, then the value of secθ + cosecθ is?
80. The value of $$\left( {\frac{{\sin \theta + \sin \phi }}{{\cos \theta + \cos \phi }} + \frac{{\cos \theta - \cos \phi }}{{\sin\theta - \sin\phi }}} \right)$$ is?
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