why is Cos2(θ/2) identical to (1+cosθ)/2 and Sin2(θ/2) identical to (1-cosθ)/2. I really need the proof @Subhotosh Khan and anyone else wishing to help.
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- Thread starter Vikash
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Deleted member 4993
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Using:why is Cos2(θ/2) identical to (1+cosθ)/2 and Sin2(θ/2) identical to (1-cosθ)/2. I really need the proof @Subhotosh Khan and anyone else wishing to help.
cos(2*α) = 2*cos2(α) - 1
Expand
cos[2 * (Θ/2)]
Further help please?Using:
cos(2*α) = 2*cos2(α) - 1
Expand
cos[2 * (Θ/2)]
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Deleted member 4993
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cos(2*α) = 2 * cos2(α) - 1Further help please?
2 * cos2(α) = cos(2*α) +1
continue....