Question

cos (2x – 6°) = cos2 30° – cos2 60°​

Answer 1

Answer:

x = 33 degree

Step-by-step explanation:

cos(2x - 6) = $cos^{2} 30^{o}$  - $cos^{2}60^{o}$

cos $30^{0}$ = $\sqrt{3} /2$

$cos^{2} 30^{o}$ = 3/4

cos $60^{o}$ = 1/2

$cos^{2}60^{o}$ = 1/4

cos (2x -6) = 3/4 - 1/4

cos (2x -6) = 1/2 = cos 60

2x - 6 = 60

2x = 66

x = 33