Question: Verify the identity. 1. Cos (x + / 2) = - sin x 2. Tan (x - / 2) = - cos x

Verify the identity.
1. Cos (x + π / 2) = - sin x
2. Tan (x - π / 2) = - cos x
3. Tan (π - x) = - tan x
4. Sin (x - π) = - sin x

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