Trig Equations Methods

 $2\sin^2x-\sin x=1$  What is your first step to solving this trig equation?

• Use an identity

• Factor

• Go straight to the unit circle

• Combine like terms

 $\cos2x-\sin x=0$  What is your first step to solving this trig equation?

• Use an identity

• Factor

• Go straight to the unit circle

• Combine like terms

 $2\cos3x-1=0$  What is your first step to solving this trig equation?

• Use an identity

• Factor

• a few simple steps then Unit Circle

• Combine like terms

 $2\cos^2x-3\cos x+1=0$  What is your first step to solving this trig equation?

• Use an identity

• Factor

• a few simple steps then Unit Circle

• Combine like terms

 $\cos\left(x+\frac{\pi}{4}\right)-\cos\left(x-\frac{\pi}{4}\right)=1$  What is your first step to solving this trig equation?

• Use an identity

• Factor

• a few simple steps then Unit Circle

• Combine like terms

 $\sin x\cos2x-\cos x\sin2x=\frac{\sqrt{2}}{2}$  What is your first step to solving this trig equation?

• Use an identity

• Factor

• a few simple steps then Unit Circle

• Combine like terms

 $\cos2x=\sin x$  What is your first step to solving this trig equation?

• Use an identity

• Factor

• a few simple steps then Unit Circle

• Combine like terms

 $\sin2x+\sin x=0$  What is your first step to solving this trig equation?

• Use an identity

• Factor

• a few simple steps then Unit Circle

• Combine like terms

 $2\cot x\sin x-\cot x=0$  What is your first step to solving this trig equation?

• Use an identity

• Factor

• a few simple steps then Unit Circle

• Combine like terms

 $3\sin^2x+7\sin x+4=0$  What is your first step to solving this trig equation?

• Use an identity

• Factor

• a few simple steps then Unit Circle

• Combine like terms