(sin70∘)(cot10∘cot70∘−1)=sin70∘cot10∘cot70∘−sin70∘=cot10∘cos70∘−sin70∘=sin10∘cos10∘cos70∘−sin70∘sin10∘=sin10∘cos(10∘+70∘)=sin10∘cos80∘=1
The value of (sin70∘)(cot10∘cot70∘−1) is
Held on 23 Jan 2025 · Verified 6 Jul 2026.
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