![sec^2(\pi /2-(x))[sin^2(x) -sin^4(x)]](/tpl/images/2414/3818/85eba.png)
Answers: 1
:
and expand that using the formula for the difference:
and all of that simplifies down to
which simplifies further to
Now we'll bring in the other term. This is what we have now:
and distribute in to get:
which simplifies to
and that, finally, simplifies down to a simple 
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Use trigonometric identities to simplify...
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