Bashing Unavailable Bcoz Of Summation!

Algebra Level 4

If sin6x=r=06arcosrx, \sin ^ 6 x = \sum_{ r = 0} ^ 6 a_ r \cos rx,

what is a0+a1+a2+a3+a4+a5+a6? a_0 + a_1 + a_2 + a_3 + a_4 + a_ 5 + a_ 6?

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