r^2=(3a)^2+(-4a)^2=25a^2,因?yàn)閍>0,所以r=5a
cosx=x/r=3a/5a=3/5
已知角x的終邊上有點(diǎn)P(3a,-4a)(a>0),求cosx
已知角x的終邊上有點(diǎn)P(3a,-4a)(a>0),求cosx
數(shù)學(xué)人氣:346 ℃時(shí)間:2020-06-15 07:54:31
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