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how to Multiplying Rational Expressions ?
To multiply fractions, or rational expressions, you must multiply the numerators and then multiply the denominators.Here's how it is done with simple fractions:
2/5 .3/7 = 2.3/5.7 = 6/35
The same method, or idea, can be used to multiply all rational expressions. The first thing that you do is factor everything completely, then you cancel the common factors and multiply. Here are some examples for you to study.
If sin? = 1/2 , show that 3cos?-4cos 3 ? = 0. Ans: Sin ? = ½ ⇒ ? = 30 o Substituting in place of ? =30 o . We get 0.
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