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OpenStudy (anonymous):
(a) Solve 3cosθ+2=0 for 0°≤θ≤360°. --->132°, 228° (b) Hence solve 3cos^(2)θ+2cosθ=0 for 0°≤θ≤180°. @hartnn
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OpenStudy (anonymous):
i don't know how to do part b.
hartnn (hartnn):
3c^2+2c = 0 c (3c+2) = 0 c=0 or 3c +2=0
hartnn (hartnn):
so what angle makes cos theta = 0 ?
OpenStudy (anonymous):
90, 270(rej)
OpenStudy (anonymous):
∴90
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hartnn (hartnn):
one will be rejected from 132°, 228° too
OpenStudy (anonymous):
228
hartnn (hartnn):
so u'll have 2 angles
OpenStudy (anonymous):
oh i see. haha i am so stupid...
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