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[" 2) What is "int(-pi)^( pi)cos(mx)cos(...

[" 2) What is "int_(-pi)^( pi)cos(mx)cos(nx)dxquad " i point "],[" when "m=n=0" ? "],[" O "2 pi],[" O "-2 pi],[" O "-pi],[" O "pi]

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Prove that int_(-pi)^( pi)cos mx cos nxdx=

I=int_(0)^(2 pi)cos^(-1)(cos x)dx

int_(0)^( pi)[cos x]dx

int_(0)^( pi)|cos x|dx

int_(0)^( pi)|cos x|dx

int_(0)^(2 pi)|cos x|dx

int_(0)^( pi)cos mx*cos nxdx(m!=n)=

int_(0)^( pi)(dx)/(1+cos x)

int_(0)^( pi)|cos x|dx=2

int_(-pi/2)^(pi/2)sin^5x.cos(1/2nx)dx= ?