已知45度

已知45度
已知45度

已知45度
因为
（sina-cosa）^2=sin^2a+cos^2a-2sina*cosa=1-2sina*cosa
而可得在原式中sina*cosa=（1/2）k
所以sina-cosa=√（1-k）

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It may be Wordless Wednesday, but I can't shut up about this. I love me some shopping deals. Especially from Staples. (Hey, it's the only office chain.

Dealio: Xbox Live 12-month card for $40. by Alexander Sliwinski on Oct 26th 2009 10:15AM. 22. Xbox Live is the frosting inside the Xbox 360's Oreo cookie. Sure, the two chocolate wafers are delicious alone, but it's that sugary stuffing ...

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