- #1

- 383

- 5

Sinx=1-cos^2x

Sinx=sin^2x

-sin^2x+sinx=0

(-Sinx-1)(sinx+0)=0

Sinx=0 or 1 so x=90+360n or x=0+360n but the textbook says "n/a and 90+360n" without showing any working out. Any help apreciated, apologies if this isn't the right thread but this isn't homework and there didn't seem to be a section for this under the homework anyway.