Question

If 3cotA = 4, then the value of cos2 A - sin 2A is

Answer 1

Answer:-

(b) $\frac{7}{25}$

Step-by-step explanation:-

Given that, cot A = 4/3

tan A =$\frac{1}{cot A}$= 3/4

The value we want is equals to cos 2A,

which equals to $\frac{1 - tan^{2} A }{1 + tan^{2} A }$

= $\frac{1 - \frac{9}{16} }{1 + \frac{9}{16} }$

= $\frac{7}{25}$

||MrCuteKing||