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sanafarghal
23.08.2020 •
Mathematics
Prove that the inequality |cos(x)| is greater than or equals to 1 - sin^2 (x)
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Ответ:
x
2
+y
2
+2xy=0
All equations of the form ax
2
+bx+c=0 can be solved using the quadratic formula:
2a
−b±
b
2
−4ac
. The quadratic formula gives two solutions, one when ± is addition and one when it is subtraction.
x
2
+2yx+y
2
=0
This equation is in standard form: ax
2
+bx+c=0. Substitute 1 for a, 2y for b, and y
2
for c in the quadratic formula,
2a
−b±
b
2
−4ac
.
x=
2
−2y±
(2y)
2
−4y
2
Square 2y.
x=
2
−2y±
4y
2
−4y
2
Add 4y
2
to −4y
2
.
x=
2
−2y±
0
Take the square root of 0.
x=−
2
2y
Divide −2y by 2.
x=−y
x
2
+y
2
+2xy=0
All equations of the form ax
2
+bx+c=0 can be solved using the quadratic formula:
2a
−b±
b
2
−4ac
. The quadratic formula gives two solutions, one when ± is addition and one when it is subtraction.
y
2
+2xy+x
2
=0
This equation is in standard form: ax
2
+bx+c=0. Substitute 1 for a, 2x for b, and x
2
for c in the quadratic formula,
2a
−b±
b
2
−4ac
.
y=
2
−2x±
(2x)
2
−4x
2
Square 2x.
y=
2
−2x±
4x
2
−4x
2
Add 4x
2
to −4x
2
.
y=
2
−2x±
0
Take the square root of 0.
y=−
2
2x
Divide −2x by 2.
y=−x
Step-by-step explanation:
Ответ:
tan 29° =
400 tan 29° = h
221.7 = h
221.7 ft