Find:$\displaystyle S=4. sin^{2}10 + 4 sin^{2}50.cos20 + cos80$
Last edited by mr fantastic; Feb 26th 2011 at 01:02 PM. Reason: Re-titled.
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Originally Posted by arm Find:$\displaystyle S=4. sin^{2}10 + 4 sin^{2}50.cos20 + cos80$ To get help you need to show some effort. Show your work and say where you're stuck.
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