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For real numbers p,q,r and s, if (cos−1p+cos−1q)(cos−1r+cos−1s)=4π2 and Δ=∣∣∣pn1qn2rn3sn4∣∣∣ where n1,n2,n3,n4∈N, then the absolute difference between the maximum and the minimum values of Δ is equal to |
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Answer» For real numbers p,q,r and s, if (cos−1p+cos−1q)(cos−1r+cos−1s)=4π2 and Δ=∣∣∣pn1qn2rn3sn4∣∣∣ where n1,n2,n3,n4∈N, then the absolute difference between the maximum and the minimum values of Δ is equal to |
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