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adnanchowdhury
 2 years ago
Trigonometric Identities question: http://d.pr/i/FsnP
I got my answer to be 3/2 but the mark scheme says 3/2.
adnanchowdhury
 2 years ago
Trigonometric Identities question: http://d.pr/i/FsnP I got my answer to be 3/2 but the mark scheme says 3/2.

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.Sam.
 2 years ago
Best ResponseYou've already chosen the best response.1\[3\cos2 \beta+19\cos \beta+13=0\] \[Use ~~~~\cos2\beta=2\cos^2\beta1\] \[3(2\cos^2\beta1)+19\cos \beta+13=0\] \[6\cos^2\beta3+19\cos \beta+13=0\] \[6\cos^2\beta+19\cos \beta+10=0\] \[(2\cos \beta+5)(3\cos \beta+2)=0\] \[\cos \beta=5/2, \cos \beta =2/3\]

adnanchowdhury
 2 years ago
Best ResponseYou've already chosen the best response.0Thanks. I made a silly mistake.
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