1.

If cos−1x1+cos−1x2+⋯+cos−1x10=10π, then the value of ∑x1+∑x1x2x3∑x1x2+∑x1x2x3x4 is equal to

Answer»

If cos1x1+cos1x2++cos1x10=10π, then the value of x1+x1x2x3x1x2+x1x2x3x4 is equal to



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