If tana = n tan Band sin A = m sin B, prove that Cos2 A = m2 – 1/ n2 – 1
If tana = n tan Band sin A = m sin B, prove that Cos2 A = m2 – 1/ n2 – 1
Elizabeth A , 9 Years ago
Grade 10
Trigonometry> If tana = n tan Band sin A = m sin B, pro...
1 AnswersVijay Mukati
Last Activity: 9 Years ago
Hint: On simplification we get, cosA = mcosB/n.
Now since cos2A = 1-sin2A = 1-m2(1-cos2B) = 1 – m2 + n2cos2A.
On simplification, we will get cos2A = (m2-1)/(n2-1). Thanks
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