Please solve an identity
回答 (1)
2009-03-11 4:58 pm
✔ 最佳答案
slove (tan X + cot Y)/(tan X tanY) = tanY cotX(tan X tanY) *( tanY cotX)
=(tanX*cotX)*(tanY*tanY)
=tan2Y<> (tan X + cot Y)
so (tan X tanY) *( tanY cotX)<>(tan X + cot Y)
so (tan X + cot Y)/(tan X tanY) <> tanY cotX
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