Find the value of cos7.5 using cos45°=1/√2
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Cos7.5=cos75/10
=15/2
Cos 15/2×3/3
Cos 45/6
1/√2/6=6/√2
3√2
=15/2
Cos 15/2×3/3
Cos 45/6
1/√2/6=6/√2
3√2
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