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[" 4.If "cos^(-1)x-cos^(-1)(y)/(2)=alpha...

[" 4.If "cos^(-1)x-cos^(-1)(y)/(2)=alpha," where "-1<=x<=1,-2<=y<=2,x<=(y)/(2)],[" then for all "x,y,4x^(2)-4xy cos alpha+y^(2)" is equal to : "],[[" (a) "4sin^(2)alpha," (b) "2sin^(2)alpha],[" (c) "4sin^(2)alpha-2x^(2)y^(2)," (d) "4cos^(2)alpha+2x^(2)y^(2)]]

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