3 years ago

What is m A.51 B.129 C.134 D.141

Mathematics

1 answer:

PSYCHO15rus [73]3 years ago

8 0

Answer:D 141 because

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TanA+tanB+tanAtanB=1 If A+B=45 degree

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See below

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$\tan A+\tan B + \tan A.\tan B = 1\\\\ \implies \: \tan A + \tan B = 1 - \tan A.\tan B \\ \\ \implies \: \frac{\tan A + \tan B}{ 1 - \tan A.\tan B } = 1\\ \\ \implies \: \tan (A + B) = 1 \\ \\ \implies \: \tan (A + B) =\tan 45 \degree \\ \\ \implies \: A + B = 45 \degree \\ \\ thus \: proved$