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OpenStudy (anonymous):
use equivalent forms of the first Pythagorean identity. if sine theta= -4/5 and terminates in quadrant 4, find cosine of theta.
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OpenStudy (anonymous):
help!!!
Directrix (directrix):
cos² θ + sin² θ = 1 --> I assume that is the first Pythagorean Identity. sine theta= -4/5 cos² θ + ( -4/5) ² = 1 Solve for cosθ Remember that cosine is positive in Quadrant 4. @meaghan25
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