cos54 cos36 - sin72 - cos18
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cos 54 sin(90-54) - sin 72 - sin (90-72)
cos 54 sin 54 - 0
cos 54 × sin 54 = 1
using the 1st identity
cos 54 sin 54 - 0
cos 54 × sin 54 = 1
using the 1st identity
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