Question

solve for x!!!
sin2x=cosx

Answer 1

sin2x=cosx
2sinxcosx=cosx
2sinxcosx - cosx = 0
cosx(2sinx - 1) = 0
take cosx=0 and 2sinx - 1 = 0
find x

Answer 2

it does help?

Answer 3

and i think this problem need interval for x...

Answer 4

yes the interval is [0,2pi]

Answer 5

and how did you get 2sinxcosx from sin2x? is that a formula?

Answer 6

yea, that is a formula ...
Ok, for cosx=0, so what wiil u get for x?

Answer 7

pi/2 and 3pi/2 i got the rest of the answers thank you:)

Answer 8

ok right... and for
2sinx - 1 = 0 or
sin x = 1/2
solve for x, i sure u can get it to....

Answer 9

pi/6 and 5pi/6

Answer 10

good job...