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OpenStudy (anonymous):
3SinA-4CosA=0; Find SinA. How to simplify without the angles? help!
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OpenStudy (anonymous):
3SinA-4CosA=0 (3SinA-4CosA)(3SinA+4CosA)=0 9Sin^2 A-16Cos^2 A=0 9Sin^2 A-16(1-Sin^2 A)=0 25Sin^2 A = 16 Sin^2 A = 16/25 Sin A = 4/5 or -4/5 (rejected)
OpenStudy (anonymous):
how come this step? (3SinA-4CosA)(3SinA+4CosA)=0
OpenStudy (anonymous):
(3SinA-4CosA)(3SinA+4CosA)=0 * (3SinA+4CosA)
OpenStudy (anonymous):
Oh Thanks!! :D
OpenStudy (anonymous):
@Davidc
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