Question

what is the value of 1+cos theta ​

Answer 1

$\bold{\red{cos2\theta = 2cos²\theta-1}}$

$\bold{1+cos\theta = \cancel{1}+2cos²\dfrac{\theta}{2}-\cancel{1}}$

$\bold{1+cos\theta = 2cos²\dfrac{\theta}{2}}$

Answer 2

Answer:

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