1.函数y=tanx/2的定义域为?2.若sina/2-cosa/2=1/5,sina等于多少?3.cos-(23元/5)与cos-(17元/4),...1.函数y=tanx/2的定义域为?2.若sina/2-cosa/2=1/5,sina等于多少?3.cos-(23元/5)与cos-(17元/4),其大小为?(那个
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![1.函数y=tanx/2的定义域为?2.若sina/2-cosa/2=1/5,sina等于多少?3.cos-(23元/5)与cos-(17元/4),...1.函数y=tanx/2的定义域为?2.若sina/2-cosa/2=1/5,sina等于多少?3.cos-(23元/5)与cos-(17元/4),其大小为?(那个](/uploads/image/z/10266201-9-1.jpg?t=1.%E5%87%BD%E6%95%B0y%3Dtanx%2F2%E7%9A%84%E5%AE%9A%E4%B9%89%E5%9F%9F%E4%B8%BA%3F2.%E8%8B%A5sina%2F2-cosa%2F2%3D1%2F5%2Csina%E7%AD%89%E4%BA%8E%E5%A4%9A%E5%B0%91%3F3.cos-%EF%BC%8823%E5%85%83%2F5%EF%BC%89%E4%B8%8Ecos-%EF%BC%8817%E5%85%83%2F4%EF%BC%89%2C...1.%E5%87%BD%E6%95%B0y%3Dtanx%2F2%E7%9A%84%E5%AE%9A%E4%B9%89%E5%9F%9F%E4%B8%BA%3F2.%E8%8B%A5sina%2F2-cosa%2F2%3D1%2F5%2Csina%E7%AD%89%E4%BA%8E%E5%A4%9A%E5%B0%91%3F3.cos-%EF%BC%8823%E5%85%83%2F5%EF%BC%89%E4%B8%8Ecos-%EF%BC%8817%E5%85%83%2F4%EF%BC%89%2C%E5%85%B6%E5%A4%A7%E5%B0%8F%E4%B8%BA%3F%EF%BC%88%E9%82%A3%E4%B8%AA)
1.函数y=tanx/2的定义域为?2.若sina/2-cosa/2=1/5,sina等于多少?3.cos-(23元/5)与cos-(17元/4),...1.函数y=tanx/2的定义域为?2.若sina/2-cosa/2=1/5,sina等于多少?3.cos-(23元/5)与cos-(17元/4),其大小为?(那个
1.函数y=tanx/2的定义域为?2.若sina/2-cosa/2=1/5,sina等于多少?3.cos-(23元/5)与cos-(17元/4),...
1.函数y=tanx/2的定义域为?2.若sina/2-cosa/2=1/5,sina等于多少?3.cos-(23元/5)与cos-(17元/4),其大小为?(那个符号打不出来去掉元上面那横)
1.函数y=tanx/2的定义域为?2.若sina/2-cosa/2=1/5,sina等于多少?3.cos-(23元/5)与cos-(17元/4),...1.函数y=tanx/2的定义域为?2.若sina/2-cosa/2=1/5,sina等于多少?3.cos-(23元/5)与cos-(17元/4),其大小为?(那个
1、x/2≠kπ+π/2,x≠kπ/2+π/4,k为整数;
2、sina/2-cosa/2=1/5,两边平方,得1-sina=1/25,则sina=24/25;
3、cos(-23π/5)=cos(3π/5),cos(-14π/4)=cos(π/4),cos(3π/5)
1. x≠2kπ+π(k∈Z)
2. 另sina/2=x,cosa/2=y, x-y=0.2, x^2+y^2=1, sina=2(sina/2)(cosa/2)=2xy,所以 (x-y)^2=x^2-2xy+y^2=1-2xy=0.2^2=0.04, 所以 2xy=0.96=sina
3. 不懂你说什么