(sin 72 +cos18 ) (sin72-cos18)=0
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(Sin 72 +cos 18) (sin 72 - cos 18) =0
[Sin 72 + cos 18] [Sin 72 - cos (90-72)]
[Sin 72 +cos 18] [Sin 72 - Sin 72]
[Sin 72 +cos 18] [ 0]
[Sin 72 +cos 18] × 0
= 0
[Sin 72 + cos 18] [Sin 72 - cos (90-72)]
[Sin 72 +cos 18] [Sin 72 - Sin 72]
[Sin 72 +cos 18] [ 0]
[Sin 72 +cos 18] × 0
= 0
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Answer:
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