高中数学...
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f(a)=-1
a=π+2kπ
f(b)=1
b=2nπ
a+b=π+2(k+n)π
(a+b)/4=(π/4)+(k+n)(π/2)
1)当(k+n)=4m时,(a+b)/4=(π/4)+2mπ,sin(a+b)/4=√2/2
2)当(k+n)=4m+1时,(a+b)/4=(3π/4)+2mπ, sin(a+b)/4=√2/2
3)当(k+n)=4m+2时,(a+b)/4=(5π/4)+2mπ, sin(a+b)/4=- √2/2
4)当(k+b)=4m+3时,(a+b)/4=(7π/4)+2mπ,sin(a+b)/4= - √2/2
答案选(A)
a=π+2kπ
f(b)=1
b=2nπ
a+b=π+2(k+n)π
(a+b)/4=(π/4)+(k+n)(π/2)
1)当(k+n)=4m时,(a+b)/4=(π/4)+2mπ,sin(a+b)/4=√2/2
2)当(k+n)=4m+1时,(a+b)/4=(3π/4)+2mπ, sin(a+b)/4=√2/2
3)当(k+n)=4m+2时,(a+b)/4=(5π/4)+2mπ, sin(a+b)/4=- √2/2
4)当(k+b)=4m+3时,(a+b)/4=(7π/4)+2mπ,sin(a+b)/4= - √2/2
答案选(A)
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