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Jony4359
05.03.2021 •
Mathematics
Consider an angle with a measure of θ=225∘.
Sketch a diagram representing the situation.
Determine the measure of the reference angle for this angle.
_______°
Now, determine the exact values of the following expressions. Your answers should include fractions and square roots, and not decimal values.
cos(θ)=
sin(θ)=
tan(θ)=
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Ответ:
cos 225° =![-\frac{\sqrt{2} }{2}](/tpl/images/1170/8210/1363f.png)
sin 225° =![-\frac{\sqrt{2} }{2}](/tpl/images/1170/8210/1363f.png)
tan 225° = 1
Step-by-step explanation:
I cannot sketch a diagram, but a 225° angle is a 3rd quadrant angle and the reference angle is 45° (225 - 180 = 45)
cos and sin are negative in the 3rd quadrant and the tan is positive
cos 225° = - cos 45° =![-\frac{\sqrt{2} }{2}](/tpl/images/1170/8210/1363f.png)
sin 225° = -sin 45° =![-\frac{\sqrt{2} }{2}](/tpl/images/1170/8210/1363f.png)
tan 225° = tan 45° = 1
Ответ:
7(x + 4) = 3
If you want to solve it, you can say:
7(x + 4) = 3
x + 4 = 3/7
x = 3/7 - 4
x = 3/7 - 28/7
x = -25 / 7
x = -3 ⁴/₇
x ≈ -3.57