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Sin 90=1
we know that if we get sum 90 when cos x+sin y then cos x=sin y
so cos 45=sin 45
cos 45 and sin 45=0.707106781
2*cos 45*sin 45=0.707106781²*2=1

we proved  2*cos 45*sin 45=1

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Sin90°= 2sin45°cos45°
We know that sin45°=cos45°=1/√2
2×1/√2 ×1/√2=2/2=1=LHS

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