Respuesta :

Explanation:
cos
2
+
tan
2
cos
2
x
=
cos
2
+
sin
2
x
cos
2
x
×
cos
2
x
=
cos
2
+
sin
2
x
cos
2
x
×
cos
2
x
=
cos
2
+
sin
2
x
=
1


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