0
== cot(x)== 1/tan(x) = cos(x)/sin(x)
Now substitute cos(x)/sin(x) into the expression, in place of cot(x)
So now:
sin(x) cot(x) cos(x) = sin(x) cos(x) (cos(x)/sin(x) )
sin(x) cos(x) cos(x)/sin(x)
The two sin(x) cancel, leaving you with cos(x) cos(x)
Which is the same as cos2(x)
So:
sin(x) cot(x) cos(x) = cos2(x) ===
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2
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