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10 questions from this quiz
a⋅(trig)2+b⋅(trig)+c=0a \cdot (\text{trig})^2 + b \cdot (\text{trig}) + c = 0a⋅(trig)2+b⋅(trig)+c=0
Between −1-1−1 and 111
Let u=sinθu = \sin \thetau=sinθ and substitute
90∘,210∘,330∘90^\circ, 210^\circ, 330^\circ90∘,210∘,330∘
cosθ\cos \thetacosθ must be between −1-1−1 and 111
60∘,120∘,240∘,300∘60^\circ, 120^\circ, 240^\circ, 300^\circ60∘,120∘,240∘,300∘
0∘0^\circ0∘ to 360∘360^\circ360∘ or 000 to 2π2\pi2π radians
u=−b±b2−4ac2au = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}u=2a−b±b2−4ac
60∘60^\circ60∘ or 240∘240^\circ240∘
0.28080.28080.2808 only
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