5.A = cos6x + 6 cos4x + 15cos2x + 10

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\frac{cos 6 x + 6 cos 4 x + 15 cos 2 x + 10}{cos 5 x + 5 cos 3 x + 10 cos x}

What is the value of ∆ if (cos6x + 6cos4x + 15cos2x + 10)/(cos5x + 5cos3x + 10cosx)= ∆cosx ?

E = $\frac{c o s 6 x + 6 c o s 4 x + 15 c o s 2 x + 10}{(c o s 5 x + 5 c o s 3 x + 10 c o s x)}$ equals to

1 + cos 2 x + cos 4 x + cos 6 x =

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