Question

if 2costeta=√3 find the value of 2costeta+1/2costeta-1

Answer 1

Given : 2cos @ = √3 Cos @ = √3/2 To find : 2 cos @+1/2 cos @-1 = 2(√3/2)+1/2(√3/2)-1 =√3+1/√3-1 =( 3+1-√3)/√3 = 4-√3/√3 =4-1.732/1.732 =1.309