Question

What is the formula of 1 + Cos 2A​

Answer 1

Answer:

1 + Cos 2A = 2cos^2A

Step-by-step explanation:

1 + Cos 2A=1+cos^2A-sin^2A

=cos^2A+sin^2A+cos^2A-sin^2A

=2cos^2A

Answer 2

$\huge\mathcal\blue {Answer}$

$cos2x=cos2x−sin2xcos2x=cos2x−sin2x</p><p></p><p>As cos2x+sin2x=1cos2x+sin2x=1, we can write,</p><p></p><p>cos2x=1−sin2x−sin2x=1−2sin2xcos2x=1−sin2x−sin2x=1−2sin2x</p><p></p><p>or 1−cos2x=2sin2x</p><p></p><p></p><p>$

Step-by-step explanation:

hope it helps you ☺️