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