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Because the cosine of some angles is positive and the cosine of some other angles is negative.
Look for a + by the positive terminal and a - by the negative terminal, or red for positive, black for negative. Some batteries have the positive terminal protruding and the negative terminal flat. Or you can get a meter that will tell you which is which,
there are some negative effects of later school start times:late finishfatiguelack of concentrationdon't get be out in the daylight as muchthey are just some of the negative effects, there are some more.
Some are positive and some are negative.