1.

Calculate without using trigonometric tables:

Answer»

`4 cos 20^(@)-sqrt(3)cot20^(@)`
`(2cos40^(@)-COS20^(@))/(sin20^(@))`
`cos^(6)(pi)/(16)+cos^(6)(3pi)/(16)+cos^(6)(5pi)/(16)+cos^(6)(7pi)/(16)`
`TAN10^(@)-TAN50^(@)+tan70^(@)`

Answer :A::B::C::D


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