why did the -sin^2(x) change into -1 + cos^2x?
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$\displaystyle \sin^{2}x+\cos^{2}x = 1.$
i don't get it
Originally Posted by asilvester635 i don't get it Do you get that if $\displaystyle s^2+c^2=1$ then $\displaystyle -s^2=-1+c^2~?$
It's a basic trig identity that by now, (judging by what you are doing), you should be familiar with. It can be rewritten as $\displaystyle -\sin^{2}x = -1 +\cos^{2}x.$
yah i forgot its a trig identity.. thanks anyways
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