找到所有关于sin，cos，tan的基本公式。

公式:

1，基本属性:

tanx=sinx/cosx？

sinx^x+cos^x=1

2.奇偶校验:

sin(-x)=-sinx

cos(-x)=cosx

tan(-x)=-tanx

3、两角和差公式:

sin(x+-y)=sinxcosy+-cosxsiny

cos(x+-y)=cosxcosy-+sinxsiny

tan(x+-y)=(tanx+-tany)/(1-+tanx tany)

4、双角度公式:

sin2x=2sinxcosx

cos2x=cos^x-sin^x=2cos^x-1=1-2sin^x

tan2x=2tanx/(1-tan^x)

5.半角公式:

sin^x/2=(1-cosx)/2

cos^x/2=(1+cosx)/2

tan^x/2=sinx/(1+cosx)=(1-cosx)/sinx

1-cosx=2sin^x/2

1+cosx=2sin^x/2

6.通用公式:

sinx=(2tanx/2)/(1+tan^x/2)

cosx=(1-tan^x/2)/(1+tan^x/2)

tanx=(2tanx/2)/(1-tan^x/2)

7、三倍角公式:

sin3x = 3 sinx-4s in 3x(sinx的立方)

cos3x=4cos^3 x-3cosx

8、积和差公式:

sinx cosy = 1/2[sin(x+y)+sin(x-y)]

cosx siny = 1/2[sin(x+y)-sin(x-y)]

cosx cosy = 1/2[cos(x+y)+cos(x-y)]

sinx siny-1/2[cos(x+y)-cos(x-y)]

9.和差乘积公式:

sinx+siny = 2 sin(x+y)/2cos(x-y)/2

sinx-siny = 2cos(x+y)/2sin(x-y)/2

cosx+cosy = 2cos(x+y)/2cos/(x-y)2

cosx-cosy =-2 sin(x+y)/2 * sin(x-y)/2