Hi All,

I am stuck on these two problems. Basically, I understand the double angle identities, but not when sin or cos is square (i.e. sin^2(2x), etc)

Here are the problems...

1. -1/2(sec^2(x) = -2sin^2(x)csc^2(2x)

2. 1/2(sin(4x)) = 2sinxcosx - 4sin(sin^3(x))cos(x)

If my notation is screwy let me know...

Any help is appreciated. Thanks!

Is Q1. or ?


Is Q2. or ?

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Two things are infinite - The Universe and Human Stupidity. Though I'm not too sure about the universe...

The latter for both questions. Also, aren't they the same thing anyway...?

No they aren't.

The latter are the equivalent of



and

.

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Two things are infinite - The Universe and Human Stupidity. Though I'm not too sure about the universe...