Question

Rewrite using only the sine function
2cos^2 x + sin^2 x =

Answer 1

2(1 - sin^2 x) + sin^2 x = 2

Answer 2

wait sorry

Answer 3

= 2 - sin^2 x

Answer 4

Can you explain?

Answer 5

because cos^2 x + sin^2 x = 1
=> cos^2 x = 1 - sin^2 x
plug that in for cos

Answer 6

outstanding, thank you

Answer 7

no pb :)