IF 0 ≤theta°≤360°find cos(2theta-10°)=-1/2
1 answer:
Answer:
θ
can be in the first quadrant
0
≤
θ
≤
90
or the fourth quadrant
270
≤
θ
≤
360
If
θ
is in the first quadrant,
then
sin
θ
=
5
13
cos
θ
=
12
13
tan
θ
=
5
12
Therefore,
sin
2
θ
=
2
sin
θ
cos
θ
=
2
×
5
13
×
12
13
=
120
169
cos
2
θ
=
cos
2
θ
−
sin
2
θ
=
(
12
13
)
2
−
(
5
13
)
2
=
144
169
−
25
169
=
119
169
If
θ
is in the fourth quadrant,
then
sin
θ
=
−
5
13
cos
θ
=
12
13
tan
θ
=
−
5
12
Therefore,
sin
2
θ
=
2
sin
θ
cos
θ
=
2
×
−
5
13
×
12
13
=
−
120
169
cos
2
θ
=
cos
2
θ
−
sin
2
θ
=
(
12
13
)
2
−
(
−
5
13
)
2
=
144
169
−
25
169
=
119
169
You might be interested in
80% of 20 is 80/100 x 20 = 16
So, kelly has used 16 stamps, and has 4 left
First tell me what elapsed time is
Answer:
the answer is B, because triangle BCA is a rotation of triangle XYZ.
Step-by-step explanation:
Answer:
true
Step-by-step explanation:
Answer:
168
Step-by-step explanation:
