×

# Prove this

Note by Ashley Shamidha
1 year, 9 months ago

Sort by:

Expand to get $$1+\cot A +\cot B +\cot A \cot B$$.Then use the formula for $$\cot (A+B)$$ to find a relation $$1+\cot A +\cot B=\cot A \cot B$$ · 1 year, 9 months ago