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Select all that are undefined. sec (45°) csc (0°) sec (90°)
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Select all that are undefined. sec (45°) csc (0°) sec (90°)

User Daniel Engmann
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sec(45°) = 1/cos(45°) = 1/(rt(2)/2) = rt(2)

csc(0°) = 1/sin(0°) = 1/0 /undefined/

sec(90°) = 1/cos(90°) = 1/0 /undefined/
User Bhavesh Daswani
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