Question

cos2x +1=? and if you know other functions of trignometry for class 11th to make questions easy plz also tell them

Answer 1

$1 + cos2x = 2 {cos}^{2} x$

Answer 2

1+cos2x= 2cos²x

since, cos2x= 2cos²x-1

(it is a trigonometric formula)

wait I am using a attachment as well for your answer hope that the attachment will help you ..