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lions [1.4K]
4 years ago
12

Find cos (2 theta angle) if sin (theta angle) =4/5

Mathematics
1 answer:
nataly862011 [7]4 years ago
5 0
Sin(theta) = 4/5,cos^{2} (theta)=1-( \frac{4}{5})^{2} = 1 -  \frac{16}{25} = \frac{9}{25} We will switch it to formula: cos(2 theta)=cos^{2} (theta)-sin^{2} (theta)= \frac{9}{25} - \frac{16}{25}=- \frac{7}{25}

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