81.
If $$\cot \theta = 4{\text{,}}$$   then the value of $$\frac{{5\sin \theta + 3\cos \theta }}{{5\sin \theta - 3\cos \theta }}$$   is?

82.
The value of cos220° + cos270° is?

83.
If rsinθ = 1, rcosθ = $$\sqrt 3 {\text{,}}$$  then the value of r2tanθ is?

84.
If secθ + tanθ = m(>1), then the value of sinθ is (0° < θ < 90°)

85.
The expression of $$\frac{{\cot \theta + \operatorname{cosec} \theta - 1}}{{\cot \theta + \operatorname{cosec} \theta + 1}}$$    is equal to?

86.
If secA + tanA = a, then the value of cosA is?

87.
If sinP + cosecP = 2, then the value of sin7P + cosec7P is?

88.
The value of the expression 2(sin6θ + cos6θ) - 3(sin4θ + cos4θ) + 1 is?

89.
If $${\text{cos}}\theta = \frac{{{x^2} - {y^2}}}{{{x^2} + {y^2}}}$$    then the value of$${\text{cot}}\theta $$  is equal to $$\left[ {{\text{if }}{0^ \circ } \leqslant \theta \leqslant {{90}^ \circ }} \right]$$

90.
If x = cosecθ - sinθ and y = secθ - cosθ, then the relation between x and y is?

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