Question
If tana and tanß are the two roots of the equation x^2-ax+b=0, express the value of cos^2a-sin^2ß in terms of a and b.
Answers
Answered by
oobleck
The roots of x^2-ax+b obey
tanA + tanB = a
tanA tanB = b
see what you can do with that
tanA + tanB = a
tanA tanB = b
see what you can do with that
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