Question

If 2cosa=√3, find the value of 2cosa+1/2cosa-1

Answer 1

2cosa=√3

then cosa=√3/2

put cosa value in 2cosa+1/2cosa-1

2×√3/2+1/2×√3/2-1

√3+√3/4-1

here lcm is 4

4√3+√3-4/4

5√3-4/4