2. Calcula el valor de cada una de las siguientes expresiones.
a) tan 180° - 2 cos 180° + 3 csc 270° + sen 90°
a) tan 180° - 2 cos 180° + 3 csc 270° + sen 90°
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Verified answer
a) tan 180° - 2 cos 180° + 3 csc 270° + sen 90°
0 - 2(-1) + 3(-1) + 1
3 - 3
0 ----rpta
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