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Sketch the graph of `y=sin^2x+2cos^2x` :
We can rewrite the right hand side:
`y=sin^2x+cos^2x+cos^2x` Use the Pythagorean relation:
So we take the values of cosx, square them, and add them to one. The values will oscillate between 1 and 2 (`0<= cosx<=1 ==> 0<=cos^2x<=1` , then you add 1.) The period is `pi` .
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