-2sin(-x+m-π/3)=-2sin(x+m-π/3) sin(-x+m-π/3)=sin(x+m-π/3) 所以-x+m-π/3=2kπ+x+m-π/3或-x+m-π/以上过程是为什么
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![-2sin(-x+m-π/3)=-2sin(x+m-π/3) sin(-x+m-π/3)=sin(x+m-π/3) 所以-x+m-π/3=2kπ+x+m-π/3或-x+m-π/以上过程是为什么](/uploads/image/z/2666579-59-9.jpg?t=-2sin%28-x%2Bm-%CF%80%2F3%29%3D-2sin%28x%2Bm-%CF%80%2F3%29+sin%28-x%2Bm-%CF%80%2F3%29%3Dsin%28x%2Bm-%CF%80%2F3%29+%E6%89%80%E4%BB%A5-x%2Bm-%CF%80%2F3%3D2k%CF%80%2Bx%2Bm-%CF%80%2F3%E6%88%96-x%2Bm-%CF%80%2F%E4%BB%A5%E4%B8%8A%E8%BF%87%E7%A8%8B%E6%98%AF%E4%B8%BA%E4%BB%80%E4%B9%88)
-2sin(-x+m-π/3)=-2sin(x+m-π/3) sin(-x+m-π/3)=sin(x+m-π/3) 所以-x+m-π/3=2kπ+x+m-π/3或-x+m-π/以上过程是为什么
-2sin(-x+m-π/3)=-2sin(x+m-π/3) sin(-x+m-π/3)=sin(x+m-π/3) 所以-x+m-π/3=2kπ+x+m-π/3或-x+m-π/
以上过程是为什么
-2sin(-x+m-π/3)=-2sin(x+m-π/3) sin(-x+m-π/3)=sin(x+m-π/3) 所以-x+m-π/3=2kπ+x+m-π/3或-x+m-π/以上过程是为什么
诱导公式
sin(a+2kπ)=sina
sin(2kπ+π-a)=sina
3a^2+3b^2+3c^2=a^2+b^2+c^2+2ab+2c+2ca
2a^2+2b^2+2c^2-2ab-2bc-2ac=0
(a^2-2ab+b^2)+(b^2-2bc+c^2)+(c^2-2ac+a^2)=0
(a-b)^2+(b-c)^2+(c-a)^2=0平方大于等于0,相加等于0,若有一个大于0,则至少有一个小于0,不成立。
所以三个都等于0
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3a^2+3b^2+3c^2=a^2+b^2+c^2+2ab+2c+2ca
2a^2+2b^2+2c^2-2ab-2bc-2ac=0
(a^2-2ab+b^2)+(b^2-2bc+c^2)+(c^2-2ac+a^2)=0
(a-b)^2+(b-c)^2+(c-a)^2=0平方大于等于0,相加等于0,若有一个大于0,则至少有一个小于0,不成立。
所以三个都等于0
所以a-b=0,b-c=0,c-a=0
a=b,b=c,c=a
所以a=b=c
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