My question is in the picture below. There might be multiple answers because it says "check all that apply".

Question

anonymous · Answer

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anonymous · Answer

Review the identities for the secant trigonometric function and you will find your answer

zepdrix · Answer

It's really important that you remember your secant/cosine relationship.$$\Large\rm \sec2x=\frac{1}{\cos2x}$$Do you know how to apply your Cosine Double Angle Formula in the denominator from that point?

anonymous · Answer

Thanks, I found my identities cheat sheet that I made a while ago. I will finish this problem myself. Cheers!

zepdrix · Answer

Cool c: