Answer:
The correct answer is 47 degrees.
Step-by-step explanation:
Use cosine.
cos(x)= adj/hyp
cos(x)=19/28
x=arccos(19/28)
Use a calculator
x is approximately 47 degrees.
Answer:
x÷4 should be the answer.
Step-by-step explanation:
Answer:
Step-by-step explanation:
We are given that:
And we want to find the value of cos(A) and sin(A).
Recall that tangent is the ratio of the opposite side to the adjacent side.
Therefore, the opposite side measures 2<em>ab</em>, and the adjacent side measures <em>a</em>² - <em>b</em>².
Using the Pythagorean Theorem, solve for the hypotenuse:
Thus, our hypotenuse is given by <em>a</em>² + <em>b</em>².
Cosine is the ratio between the adjacent side and the hypotenuse. Thus:
And sine is the ratio between the opposite side and the hypotenuse. Thus:
In conclusion:
Answer:
If
x
y
=
sin
x
, using the product rule:
y
+
x
y
'
=
cos
x
□
y
'
+
y
'
+
x
y
'
'
=
−
sin
x
△
△
x
+
□
⇒
2
y
'
x
+
y
'
'
+
y
+
x
y
'
=
−
sin
x
x
+
cos
x
As
y
=
sin
x
x
and
y
+
x
y
'
=
cos
x
:
2
y
'
x
+
y
'
'
+
cos
x
=
−
y
+
cos
x
⇒y''+2y,
x+y=0