Prove Sin π/8 cosπ/8 =1/2√2
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Sin pie/8.cos pie/8
1/2.2sin pie/8.cos pie/8
1/2 .sin 2(pie/8)
1/2sin pie/4
1/2.1/rute2
1/2rute2
1/2.2sin pie/8.cos pie/8
1/2 .sin 2(pie/8)
1/2sin pie/4
1/2.1/rute2
1/2rute2
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