How to verify trig identities on the TI Nspire

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I'm having trouble turning trig functions into expressions that the TI Nspire can read/accept. I'm trying to verify them.

Example problems

1. Cot 0/Csc 0 = Cos 0

2. tan^2 y + 1/sec y = sec y

3. cot s + tan s = sec s csc s

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trig.png (3.3 Kio) Vu 11759 fois

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Thank you.