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If sinx =2/3, then find the value of cos...

If `sinx =2/3`, then find the value of `cos3x`.
यदि `sinx =2/3` ,तो `cos3x` का मान ज्ञात कीजिए।

A

0.6735

B

`-0.8765`

C

`-0.5797`

D

0.5678

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