`2cosx-cos3x-cos5x=`

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2cos x-cos3x-cos5x=

Prove the following: (frac(sinx-sin3x+sin5x-sin7x)(cosx-cos3x-cos5x+cos7x))=cot2x

Solve cosx+cos3x-2cos2x=0

Solve: cos3x+cosx-cos2x=0

Solve cos3x+cosx-cos2x=0

lim_(x to 0) (cos5x-cos7x)/(cosx-cos5x)

Evaluate : underset(xrarr0)"lim"(cos5x-cos7x)/(cosx-cos5x)