Mathematics
Senior High
Solved
線を引いた場所の計算がわかりません...
(1) cosmxcos nx
=1/2lcos(m+n)x+cos(m-nx
よって
m≠nのとき
与式=
1sin (m+n)x
sin(m-n)x
花
+
=0
2
m+n
m-n
10
m=nのとき
T
与式 = 1/20 (cos2mx+1)dx
0
1
1
sin2mx+x
22m
1|2
したがって
m≠nのとき 0,
m=nのとき
〃2
02
Answers
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