without using trignometry table , evaluate the following .......sin 18 / cos 72 + √3( tan10 tan30 tan40 tan50 tan80)
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cos72/cos72+√3(cot80tan30tan40cot40tan80)
1+√3(1/tan80*tan30*tan40*1/tan40*tan80)
1+√3(tan30*1)
1+√3*1/√3
1+1
2