Question

Can anyone help me with this trigonometry questions????? find the maximum value of 2 sin x - cos x.i will give you a medal....

Answer 1

the question is in the picture form

Answer 2

2 sin x - cos x = R cos(x+a)
this looks like fun

Answer 3

any idea to show how this is true

Answer 4

yup and confusing....

Answer 5

cos(x + y) = cos x cosy - sin x sin y

Answer 6

2 sin x = 2*cos(x-pi/2)

Answer 7

use that identity above to rewrite this expression