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the interval in which the function f(x)=sin^4x+cos^4x increasing function1) 0 < x < pi/82) pi/4 < x < 3pi/83) 3pi/8 < x < 5pi/84) 5pi/8 < x < 3pi/4

Answer» the interval in which the function f(x)=sin^4x+cos^4x increasing function
1) 0 < x < pi/8
2) pi/4 < x < 3pi/8
3) 3pi/8 < x < 5pi/8
4) 5pi/8 < x < 3pi/4


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