2a(1+x%)²-a(1-x%)²
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2a(1+x%)²-a(1-x%)²2a(1+x%)²-a(1-x%)²2a(1+x%)²-a(1-x%)²2a(1+x%)²-a
2a(1+x%)²-a(1-x%)²
2a(1+x%)²-a(1-x%)²
2a(1+x%)²-a(1-x%)²
2a(1+x%)²-a(1-x%)²
=a*[2(1+2*x%+ x%*x%)- (1- 2*x%+x%*x%)]
=a*[2+4*x%+ 2(x%)²- 1 + 2*x%-(x%)²]
=a*[1+6*x%+ (x%)²]