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Verify the identity: `cot^2(y)[sec^2(y)-1]=1`
Use the pythagorean identity `1+tan^2(y)=sec^2(y).`
If `tan^2(y)` is isolated the identity would be `tan^2(y)=sec^2(y)-1.`
Because tan(y) and cot(y) are reciprocals their product is equal to 1.
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