Question
If cosx/siny = n and cosx/cosy = m, then the value of cos 2 y is:
If cosx/siny = n and cosx/cosy = m, then the value of cos 2 y is:
1. m 2 /(m 2 + n 2 )
2. 1/(m 2 + n 2 )
3. n 2 /(m 2 + n 2 )
4. 0
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