Do HomeworkEmma Holt Chegg Study I Guided Solutions and Ma H

Do Homework-Emma Holt Chegg Study I Guided Solutions and Ma Homework: 5.4 and 5.5 Score: 0 of 1 pt 5.5.9 10 of 12 Use identities to find values of the sine and cosine functions of the function for the angle measure. 2x, given tanx-3 and cosx>0 cos 2x (3implty your answer, including any radicals. Use integers or fractons for any numbers in the expression.) esc F3 14 FS

Solution

tanx = 3_/1

sinx= 3_/(3²+1²),cosx= 1_/(3²+1²),

sinx= 3_/10,cosx= 1_/10,

cos(2x) =cos²x -sin²x

cos(2x) =(1_/10)² -(3_/10)²

cos(2x) =(1_/10) -(9_/10)

cos(2x) = -(8_/10)

cos(2x) = -(4_/5)

sin(2x) =2sinx cosx

sin(2x) =2(3_/10)(1_/10)

sin(2x) =6_/10

sin(2x) =3_/5