cosθ=2/5, tan θ<0 Find sin θ.
cos theta = 2/5
sin theta = sqrt(1-cos theta^2)
sin theta = sqrt( 1-4/25) = sqrt(21/25) = sqrt(21)/5= ±0.916515
Since tan theta < 0, sin theta = -0.916515 = -0.92
Content will be erased after question is completed.
Enter the email address associated with your account, and we will email you a link to reset your password.
Forgot your password?