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vekshin1
2 years ago
10

Sina=3/5 find cos2a​

Mathematics
1 answer:
yarga [219]2 years ago
6 0

Answer:

\huge \purple{\therefore \cos2a}  \orange{= }\red{\frac{7}{25}  }

Step-by-step explanation:

\because \cos2a =1 -  2 { \sin}^{2} a \\  \\   \therefore \cos2a =1 -  2 \bigg( {  \frac{3}{5} }\bigg) ^{2}  \\  \\\therefore \cos2a =1 -  2  \times  \frac{9}{25}   \\  \\\therefore \cos2a =1 -   \frac{18}{25}   \\  \\\therefore \cos2a =  \frac{25 - 18}{25}   \\  \\ \huge \purple{\therefore \cos2a}  \orange{= }\red{\frac{7}{25}  } \\  \\

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