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(d^(20))/(dx^(20))(2cosxcos3x)is equal t...

`(d^(20))/(dx^(20))(2cosxcos3x)`is equal to (a)`2^(20)(cos2x-2^(20)cos3x)` (b)`2^(20)(cos2x+2^(20)cos4x)` (c)`2^(20)(sin2x+2^(20)sin4x)` (d)`2^(20)(sin2x-2^(20)sin4x)`

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(d^(20))/(dx^(20))(2cos x cos3x)=2^(20)(cos2x-2^(20)cos4x)(b)2^(20)(cos2x+2^(20)cos4x)(c)2^(20)(sin2x+2^(20)sin4x)(d)2^(20)(sin2x-2^(20)sin4x)

(2cos40^(@)-cos20^(@))/(sin20^(@))

(2cos40^(@)-cos20^(@))/(sin20^(@))

(2cos40^(@)-cos20^(@))/(sin20^(@))=?

(2cos 40^0-cos 20^0)/(sin 20^0)=

int(a^(2)sin^(2)x+b^(2)cos^(2)x)/(a^(4)sin^(2)x+b^(4)cos^(2)x)dx

int((sqrt(2sin2x+4cos^(2)x+sin4x)-2x)/(1+sin2x))dx

int_(0)^( pi/4)(x^(2)(sin2x-cos2x))/((1+sin2x)cos^(2)x)dx

int(4cos^(2)x-3sin^(2)x)/(sin^(2)2x)d(4x)=

(cos20^(@)-sin20^(@))/(cos20^(@)+sin20^(@))=tan25^(@)