Question

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

Answer 1

sin(90-18)/cos 72+√3(tan(90-10)tan30tan40tan(90-50)tan80)

cos72/cos72+√3(cot80tan30tan40cot40tan80)

1+√3(1/tan80*tan30*tan40*1/tan40*tan80)

1+√3(tan30*1)

1+√3*1/√3

1+1

2

Answer 2

here's your answer..