Zoe S.

asked • 03/17/21# Verify the following identity

1)sin2x+sin4x/cos2x+cos4x=tan3x

both sins are over the cos

please show work seeing the problems worked out helps me understand where I went wrong when I first worked it out and I learn better by seeing the steps. goes for both problems I am not being graded on these I just want to see the steps so I can take notes

2)cos2(x/2)=secx+1/2secx

## 1 Expert Answer

1) Use the sum formula: the numerator is 2 sin 3x cos x, the denominator is 2 cos 3x cos x...and I had to look up the sum formula!

2) Your notation is equivocal!

Zoe S.

I know I just wanted to see someone else work them out so I can see where I went wrong when I had done mine03/19/21

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Mark M.

You could post your work. We could see where you went "wrong".03/17/21