Question

if cosec a = 2 , find the value of cos 2a-sin2a
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Answer 1

Answer:

$22 < | { < < < < 3 \frac{ - \times > y \leqslant . < { \frac{2 {yx { {24.5. {x2223210(x}^{2} \times \frac{?}{?} }^{2} }^{?} }^{2} }{?} }^{2} \times \frac{?}{?} \times \frac{?}{?} }{?} \times \frac{?}{?} \times \frac{?}{?} }^{?} |$

Answer 2

Answer:

CosecA = 2

So A = 30°

Now

Cos2A - Sin2A

= Cos 60° - Sin 60°

= (1/2) - ( √3 /2)

= ( 1- √3)/2

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