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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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