Answers edited by Ashish R.
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How do you solve
3
x
+
2
y
+
6
z
=
2
and
x
+
y
+
2
z
=
1
and
2
x
+
2
y
+
5
z
=
3
using matrices?
What is a general formula for an ester?
How do you prove
−
2
cos
2
x
tan
(
−
x
)
=
sin
2
x
?