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Given cos x=-1/4 and sin y= w /w/ Where angles x y are in QIl. Determine exact valus of 1. Sin (2x) 2. Tanksin COS

Given cos x=-1/4 and sin y= w /w/ Where angles x y are in QIl. Determine exact valus of 1. Sin (2x) 2. Tanksin COS X

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