Jawabanmu

2014-03-25T10:02:02+07:00
Buktikan: p²(cos²α-sin²α)² + (2p.sinα.cosα)² = p²

= p²(cos²α-sin²α)² + (2p.sinα.cosα)²
= p²(cos2α)² + p²(2sinα.cosα)²
= p²(cos²2α) + p² (sin2α)²
= p²(cos²2α) + p² (sin²2α)
= p²(cos²α + sin²α)
= p²(1)
= p² 

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