Question

solve this formula: 1+cos theta=?​

Answer 1

Answer:

2cos² theta/2

Step-by-step explanation:

1+cos theta = ??

cos 2theta = cos² theta - sin² theta

cos 2theta = cos² theta - ( 1 - cos² theta)

cos 2theta = 2cos² theta -1

cos 2theta + 1 = 2cos² theta

1 + cos theta = 2cos² theta/2

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