if cot x= -3/4,x in 2 quadrant then find sinx/2,cosx/2,tanx/
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4
Answer:
There are actually four values for
x
2
on the unit circle, so four values for each trig function. The principal value of the half angle is around
2.2
∘
.
cos
(
1
2
Arc
cot
13
)
=
cos
2.2
∘
=
⎷
1
2
(
1
+
13
√
170
)
sin
(
1
2
Arc
cot
13
)
=
sin
2.2
∘
=
⎷
1
2
(
1
−
13
√
170
)
tan
(
1
2
Arc
cot
13
)
=
tan
2.2
∘
=
√
170
−
13
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