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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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posledela
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4 0
3 years ago
two angles of a triangle measure 58 degrees and 104 degrees what is the measure of the third angle? A) 18 degrees B) 28 degrees
kifflom [539]

Answer:

a) 18

Step-by-step explanation:

you first add the 58 and 104 degrees,

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8 0
4 years ago
Read 2 more answers
A total of 294 tickets were sold for the school play. They were either adult tickets or student tickets. The number of student t
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A+s=294
s=2a

Use substitution
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tino4ka555 [31]

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7 0
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