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Step-by-step explanation:
or, n=sinacosb/cosasinb
Vol 97
or, n=m (cosb/cosa)
--(2)
or, ncosa=mcosb
or, n²cos²a=m²cos²b
or, n²cos²a=m²(1-sin²b) [::, sin²a+cos²a=1]
or, n²cos²a=m²(1-sin²a/m²) [using (1)]
or, n²cos²a=m²((m²-sin²a)/m²)
or, n²cos²a-m²-sin²a
or, n²cos²a=m²-(1-cos²a)
or, n²cos²a=m²-1+cos²a
or, n²cos²a-cos²a=m²-1
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