Report - Goniometrie - iiw.kuleuven.be · kwadrant sin cos tan cot sec csc 1ste 5/13 12/13 5/12 12/5 13/12 13/5 2de 5/13 -12/13 -5/12 -12/5 -13/12 13/5 2.5.2 Bewijs de volgende identiteit

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