02 does google tv have youtube tv(請問：已知三角形ABC是銳角三角形，P=sinA+sinB,Q=買粉絲sA+買粉絲s+買粉絲sB,則P與Q的關系為什么，為什么？)

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請問：已知三角形ABC是銳角三角形，P=sinA+sinB,Q=買粉絲sA+買粉絲s+買粉絲sB,則P與Q的關系為什么，為什么？

最簡單方法，等邊特例，有P>Q

記得這個結論吧，如果A,B為銳角，A+B=90，有sinA=買粉絲sB

那么，如果A+B>90，有sinA>買粉絲sB 且sinB>買粉絲sA

銳角三角形這個條件說明除A，B是銳角外，恰滿足A+B>90

把兩個不等式相加得到

很赞哦!（4512）