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Stella [2.4K]
3 years ago
7

Evaluate using exact values 1-cos45/1+cos45

Mathematics
1 answer:
Lisa [10]3 years ago
3 0
Knowing that cos(45°) = 1/√2 is the way forward.

\frac{1-\frac{1}{\sqrt{2}} }{1+\frac{1}{\sqrt{2}}} = \frac{\sqrt{2}-1}{\sqrt{2}+1} = 3 - 2\sqrt{2}

The last step in the equation may not be obious, but the trick here is to multiple numerator and denominator with (1-√2), then the denominator has the special product (a+b)(a-b) = a²-b². 
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Which ordered pairs is a solution to -5x + 3y &gt; 12?
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9514 1404 393

Answer:

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2 years ago
What is 4/25 times 15/16
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7 0
2 years ago
Read 2 more answers
Math brainiest NEEDED. its the bottom half and please explain your answer
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2) They are equivalent. Again, expand and multiply the second expression. 2(3n + 4) becomes 6n + 8. This makes both sides equal.

3) They are equivalent. In the parentheses, you are adding 3 y's and a 2. This gives you 3y + 2. Now add the additional 3y that follows the closed parentheses. You'll have 6y + 2. Now both sides are equivalent.
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3 years ago
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