Question

if cos2 theta + 2 cos theta is always ​

Answer 1

Answer:

cos2 theta+2cos theta

2cos^2 theta-1+2cos theta

2(cos theta+1/2) ^2-3/2

2(cos theta+1/2) ^2>or equal to 0 for all theta

2(cos theta+1/2) ^2-3/2>or equal to -3/2 for all theta

cos2 theta+2cos theta>or equal to -3/2 for all theta

Maximum value of this expression is 3

Step-by-step explanation:

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