Question

Am I on the right path?? Trig equation.

\( \cos^2 = sin \)
\( 1-sin^2 = sin \)
\( -sin^2-sin+1 \)

Answer 1

yes - but there's an error on the last line - watch the signs
and where is the '= 0'

Answer 2

kk, got ya. Just needed to make sure I was legal by taking cos^2 and transforming it into 1-sin^2 in an equation :-)

Answer 3

where is the error?? the -sin^2??

Answer 4

Oh - sorry there's no error (silly me!)i
-sin^2 x - sin x + 1 = 0
but its easier to solve quadratic equations with a positive term in x^2
so change all signs giving
sin^2 x + sin x - 1 = 0

Answer 5

Yes, thanks!!!

Answer 6

yw