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