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Verified answer
Indetitas trigonometrisec a = 1/cos a
csc a = 1/sin a
sec² a + csc² a = csc² a . sec² a
ruas kiri
sec² a + csc² a =
= 1/cos² a + 1/sin² a
= (sin² a + cos² a) / (sin² a cos² a)
= 1/ (sin² a. cos² a)
= 1/sin² a . 1/cos² a
= csc² a . sec² a
(terbukti)
1/cos² a + 1/sin² a