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Show that 1/(sin 10^@) - sqrt3/(cos 10^@...

Show that `1/(sin 10^@) - sqrt3/(cos 10^@) = 4`

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`(1)/(sin 10^(@))-(sqrt(3))/(cos10^(@))=(cos10^(@)-sqrt(3)sin10^(@))/(sin10^(@)cos10^(@))`
`=4xx((1)/(2)cos10^(@)-cos30^(@)sin 10^(@))/(sin20^(@))`
`=4xx(sin20^(@))/(sin 20^(@))=4`.
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CENGAGE-TRIGONOMETRIC RATIOS AND TRANSFORMATION FORMULAS-Exercise 3.4
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