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OpenStudy (cutiecomittee123):
cos(65 degrees)=sqrt(1+cos130/2) true or false please explain why and how it is either true or false. My instant gues is that it is true because cos^2 x=1+cos(2x)/2 and from that the equation given will fit into that expression.
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OpenStudy (rizags):
Can you use a calculator or is it not allowed?
OpenStudy (cutiecomittee123):
No, but I was right about it being true and my reasoning also made sense. Thank you though:) I kinda just posted this for validation.
OpenStudy (rizags):
Ah. No problem!
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