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OpenStudy (anonymous):
Find all solutions to the equation cos(x)cos(3x)+sin(x)sin(3x)=0 on the interval (0,2π) Check all that apply. A. x=π/4 , 7π/4 B. x=π/4 , 3π/4 , 5π/4 , 7π/4 C. x=π/4 , 3π/4 D. x=π/4 , 3π/4 , 5π/4
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OpenStudy (anonymous):
The answer is B for anyone who might need this in the future (:
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