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If `underset(i=1)overset(10)sum(cos ^-1 x_i+cos ^-1 y_1)=20 pi`, then the value of `underset(I le1)sum underset(I le 10) sum x_i y_j ` is

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CENGAGE-INVERSE TRIGONOMETRIC FUNCTIONS-Question Bank
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  17. If alpha=sin (sin ^-1 (1)/(sqrt(3)) beta=cos (cos ^-1(1/sqrt5)-sin ^-1...

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  18. Number of integers in the domain of cos ^-1(log 2(x/3)) is

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  19. Let x=tan ^-1(tan 2)+tan (tan ^-1 2), then [x]+sgn(x) is equal ...

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  20. If underset(i=1)overset(10)sum(cos ^-1 xi+cos ^-1 y1)=20 pi, then th...

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