求值:1/sin50°+√3/cos50°

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求值:1/sin50°+√3/cos50°求值:1/sin50°+√3/cos50°求值:1/sin50°+√3/cos50°1/sin50°+√3/cos50°=(cos50+√3sin50)/(s

求值:1/sin50°+√3/cos50°
求值:1/sin50°+√3/cos50°

求值:1/sin50°+√3/cos50°
1/sin50°+√3/cos50°
=(cos50+√3sin50)/(sin50 cos50)
=2(1/2cos50+ √3/2sin50)/(1/2(sin100))
=4(sin(50+30)/sin100
=4sin80/sin100
=4