don't know how to use double or half angle formula to solve the equation: sin2x+cosx=0 in the interval [0, 2pi) and the answers are pi/2, 7pi/6, 3pi/2, 11pi/6
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Originally Posted by guardofthecolor4ever don't know how to use double or half angle formula to solve the equation: sin2x+cosx=0 in the interval [0, 2pi) and the answers are pi/2, 7pi/6, 3pi/2, 11pi/6 Substitute . Now factorise the resulting expression. Now apply the null factor law to get two simple trig equations that you need to solve over the given interval:
thanks!
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