prove that: cot (15/2) = 61/2 + 41/2 + 31/2 + 21/2
Added by Tanya H.
Step 1
We can use the half-angle formula for cotangent: cot(θ/2) = (1 + cosθ) / sinθ In this case, θ = 15 degrees, so we have: cot(15/2) = (1 + cos 15) / sin 15 Show more…
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