131.
If $$\sqrt 3 $$ tanθ = 3sinθ, then the value of (sin2θ - cos2θ) is?

132.
If sinθ = $$\frac{a}{b}$$  then the value of secθ - cosθ is? (where 0° < θ < 90°)

133.
If $$sec\theta = x + \frac{1}{{4x}}$$   $$\left( {{0^ \circ } < \theta < {{90}^ \circ }} \right)$$   then $$sec\theta $$  + $${\text{tan}}\theta $$   is equal to?

134.
If secθ + tanθ = 2 + $$\sqrt 5 {\text{,}}$$  then the value of sinθ + cosθ is?

135.
If secα + tanα = 2, then the value of sinα is (assume that 0 < α < 90°)

136.
If A is an acute angle and cotA + cosecA = 3, then the value of sinA is?

137.
If θ is positive acute angle and 3(sec2θ + tan2θ) = 5, then the value of cos2θ is?

138.
If the sum and difference of two angles are 135° and $$\frac{\pi }{{12}}$$  respectively, then the value of the angles in degree measure are?

139.
If cosx + cos2x = 1,the numerical value of (sin12 + 3sin10x + 3sin8x + sin6x - 1) = ?

140.
If cosθ + sinθ = $$\sqrt 2 $$ cosθ, then cosθ - sinθ is?

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