hey! can anybody please help me solve this question please! 2Cos(x/2)=square root two
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or this question: 5cos3x=-3 thank-you!please reply!
Hello, Jane! Divide by 2: . Now what angle has a cosine of ? . . That's right . . . So we have: . Therefore: . We have: . Then: . Therefore: .
thanks a lot!
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