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Calculate without using trigonometric ta...

Calculate without using trigonometric tables: (a) `4 cos 20^@ - sqrt3 cot 20^@`

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Calculate without using trignometric tables : 4 cos20^∘−√3cot20^∘

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4\ cos\ 20^0\ -sqrt(3)\ cot\ 20^0\ =

4\ cos\ 20^0\ -sqrt(3)\ cot\ 20^0\ =

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Without using trigonometric tables, prove that sec70^(@)sin 20^(@) + cos 20^(@) cosec 70^(@)=2 .