If cos theta = x, then cos 2theta =
Answers
Answered by
2
Step-by-step explanation:
we know the formula cos 2# is 2cos2# - 1
so cos 2 theta is 2x^2 - 1
Answered by
0
Answer:
±
2
1
cos 2θ=
2
−1
we know cos
2
θ=2cos
2
−1
2cos
2
θ=1−
2
1
=
2
1
.
cos
2
=
4
1
cos θ=
4
1
=
2
+1
∴ cos θ=±
2
1
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