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10 lines
563 B
Plaintext
10 lines
563 B
Plaintext
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^ \pi ^ \pi ^
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normal (t) = x(t) · cos ─── - y(t) · sin ─── = - y(t)
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x 2 2
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^ \pi ^ \pi ^
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normal (t) = \underbrace x(t) · sin ─── + y(t) · cos ─── = x(t)
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y 2 2 o
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90 旋转
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