1) given
2) definition of an angle bisector
3) reflexive
4)
(ASA)
5)
(CPCTC)
True.
two angles would be complementary if the sum of their angle measures is 90 degrees.
60 degrees and 30 degrees make a complementary angle while 90 and 90 degrees make a supplementary angle.
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Recall that

Dividing both sides by cosh²(x) gives

Also, recall the identity

Then

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