Diamond Q.

asked • 9d

Precalculus Question

Find the value of sin 2θ, cos 2θ and tan 2θ in the interval (pi/2,pi) if cosθ=-4/5

1 Expert Answer


Mark M.

The interval is pi/2 to pi, i.e. the second quadrant. tan 2u = (2 tan u) / (1 - tan^2 u)


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