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OpenStudy (anonymous):
Trig help, please. Medal and fan if you help me out. 1. Evaluate cos(a+b) sin a = -7/25, cot b = -8/15 neither are in quadrant IV 2. Evaluate cos(a-b) tan a = 4/3, sin b = -7/25; pi < a < 3pi/2, 3pi/2 < b < 2pi (Exact answers no decimals)
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OpenStudy (anonymous):
Here are some hints 1.)If you are giving 1 trigonometric ratio, you can find all the others using identities 2.)Try using the formula cos(a+b)=cosacosb-sinasinb 3.)The pythagorean triplets in questions are 7,24,25 and 8,15,17 and 3,4,5
OpenStudy (anonymous):
\(\huge\color{red}{cos(a+b)=cosacosb-sinasinb}\) \(\huge\color{red}{cos(a-b)=cosacosb+sinasinb}\)
OpenStudy (anonymous):
Thank you guys so much this really helped
OpenStudy (anonymous):
:)
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