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if A=sin^2x-4sinx+2 then, for x in R ...

if `A=sin^2x-4sinx+2` then, for `x in R`
a. `-1lt=Alt=8` b. `-1lt=Alt=7` c. `-1lt=Alt=9` d. None of these

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If y=(sin^4x-cos^4x+sin^2xcos^2x)/(sin^4x+cos^4x+sin^2xcos^2x),x in (0,pi/2) , then (a) -3/2lt=ylt=1/2 (b) 1lt=ylt=1/2 (c) -5/3lt=ylt=1 (d) none of these

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