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प्रश्न
Choose the correct alternative:
The function sin4x + cos4x is increasing in the interval
पर्याय
`[(5pi)/8, (3pi)/4]`
`[pi/2, (5pi)/8]`
`[pi/4, pi/2]`
`[0, pi/4]`
उत्तर
`[pi/4, pi/2]`
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