Verify:
2-sec^2y
cos2y= ----------
sec^2y
Please help.
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Verify:
2-sec^2y
cos2y= ----------
sec^2y
Please help.
It took a while for me to understand what you're asking, but I believe it's this:
The right hand side divides out like this:
One of the first things to do when presented with functions of secant, cosecant, cotangent etc is to convert them to their sine and cosine equivalents - that makes it much easier to handle. So the right hand side becomes:
Now hopefully you can see how it equals the left hand side: cos(2y).
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