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Jawaban paling cerdas!
2014-04-19T22:49:23+07:00
Sin^2 \alpha + Cos^2 \alpha = 1 selanjutnya kita membahas soal
x^2cos^2α + y^2sin^2α + 2xysinαcosα + x^2sin^2α + y^2c0s^2α - 2xysinαcosα
= x^2(sin^2α + cos^2α) + y^2( sin^2α + cos^2α)
= x^2 + y^2  (terbukti)
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