已知sina=2根号5/5求tan(a+π)+sin(5π/2+a)/cos(5π/2-a)
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![已知sina=2根号5/5求tan(a+π)+sin(5π/2+a)/cos(5π/2-a)](/uploads/image/z/561741-69-1.jpg?t=%E5%B7%B2%E7%9F%A5sina%3D2%E6%A0%B9%E5%8F%B75%2F5%E6%B1%82tan%28a%2B%CF%80%29%2Bsin%285%CF%80%2F2%2Ba%29%2Fcos%285%CF%80%2F2-a%29)
已知sina=2根号5/5求tan(a+π)+sin(5π/2+a)/cos(5π/2-a)
已知sina=2根号5/5求tan(a+π)+sin(5π/2+a)/cos(5π/2-a)
已知sina=2根号5/5求tan(a+π)+sin(5π/2+a)/cos(5π/2-a)
原式
=tana+cosa/sina
=1/(sinacosa)
∵sina=2√5/5,
∴cosa=±√5/5
∴原式=±5/2