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Hello, can someone help me with solving integral (sin^2x-cos^2x)/(sin^4x+cos^4x) ? Why are so many time related numbers divisible by 6? A minute, and hour, a month, 12 months, 24 hours in a day? Cu+fe (no3)2? How do I evaluate this mathematical problem? Two species are very similar. Name three types of evidence you could find to provide evidence that they had a common ancestor.?