Chen19241
12.06.2020 •
Mathematics
|x-9|=18 what is the absolute value
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Ответ:
The absolute value of x in that equation is 9. X is -9, and the absolute value of -9 is 9.
Ответ:
Sin a = cos b
sin a = sin (90-b)
a =90-b
a+b =90,
From angle sum property, we know that
In a triangle, a + b + c =180
90+c =180
c =90°.
Now cos90° = 0.
Therefore, cosc =0
Hope this helps!