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OpenStudy (anonymous):
find all values of x in the interval [0,2pi] that satisfy the equation 7sin(2X)=7cos(x)
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OpenStudy (cwrw238):
use the identity sin(2x) = 2 sin(x)cos(x): so 7*2sin(x)cos)x - 7cos(x) = 0 now factior the LHS as the next step to solving
OpenStudy (cwrw238):
hint: divide through by 7 as well
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