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Let P(x, y) be the terminal point on the unit circle determined by t. Then sint=,cost=, and tant=.
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Solve the equation sin(3x)cos(x)=23 for x∈[0,π2) but I could not do it. I tried to develop sin(3x)=sin(x+x+x) and I arrived at the step where the equation becomes (4cos2(x)−1)sin(x)cos(x)=23 and I could not go further !
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