Trig identity... sin/cos = tangent
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sine graph will be formed at origine of graph and cosine graph is find on y-axise
The anti derivative of negative sine is cosine.
Generally, the derivative of sine is cosine.
Period is how long it takes for the sine and cosine functions to restart repeating themselves. Both have a period of 2pi (360 degrees).
There is no real significance to sine plus cosine, now sin2(x) + cos2(x) = 1 for any x, where sin2(x) means to take the sign of the number, then square that value.