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ICSE Class 10 Answered

if  9sinß+40cosß=41 proov   41cosß=40
Asked by dr_pradip27121972 | 08 Sep, 2018, 11:13: AM
answered-by-expert Expert Answer
9sinß + 40cosß = 41
Dividing by cos ß on both sides we get
9tanß + 40 = 41secß
Using trigonometyrical identity
1 + tan2 ß = sec2 ß
we get tan ß = 9/40
Using the same identity as per above find sec ß we get sec ß = 41/40
Hence, cos ß = 40/41
41cos ß = 40
Answered by Sneha shidid | 11 Sep, 2018, 09:32: AM

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