basilrazi
Nov 3, 2008, 01:12 AM
I cannot get past this:
2cos2x+2cos2x=1-7sinx
4cos2x=
basilrazi
Nov 3, 2008, 01:13 AM
sorry pressed eneter
4cos2x=1-7sinx
ebaines
Nov 3, 2008, 10:29 AM
Recall that cos2x = 1 - 2 sin^2x. Now you have a quadratic and can solve for sinx.