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When proving an identity, you may manipulate only one side of the equation throughout. You may not use normal algebraic techniques to manipulte both sides. Let's begin with the identity you wish to prove. cos2x - sin2x ?=? 2cos2x - 1 We know that sin2x + cos2x = 1 (Pythagorean Identity). Therefore, sin2x = 1 - cos2x. Substituting for sin2x, we may write cos2x - (1 - cos2x) ?=? 2cos2x - 1 cos2x - 1 + cos2x ?=? 2cos2x - 12cos2x -1 = 2cos2x - 1 The identity is proved. (Note that once the identity is proved, you may remove the question marks from around the equal sign.)
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Prove that 2 divided by10 equals 2?
Cannot prove that 2 divided by 10 equals 2 because it is not true.
How can you prove that 1 plus 1 equals 3?
You can't it equals 2. You can't it equals 2.
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No you can not prove that 9 +10 = 21.
Love equal what?
No, but there is a way to prove that zero equals one.
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Using faulty logic.
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a0=(a-1\a-1)=a\a=1
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Using a calculator
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AAS (apex)
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SAS
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It is extremely difficult to prove things which are not true.
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Delta H equals delta E plus delta nRT prove?
Yes
