AM-2654

Basic trigonometric identities

A Math · Secondary 4 · Medium · Basic trigonometric identities

1. All $x$ with $0^\circ<x<180^\circ$ and $x\neq90^\circ$
2. All $x$ with $0^\circ<x<180^\circ$
3. Only $x=45^\circ$
4. No solution in $0^\circ<x<180^\circ$

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