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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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92​% of what number is 253​?
Romashka-Z-Leto [24]
Let, the number = x
Then, x * 92% = 253
x = 253 / 0.92   [ 92% = 0.92 ]
x = 275

In short, Your Answer would be 275

Hope this helps!
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Can someone please help me? Please show your work for each answer. Thank you in advance :)
sergey [27]

Answer:

6. c = 5

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Step-by-step explanation:

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