buktikan sin a + tan a : 1 + cos = tan a
Matematika
yandaazizhusein
Pertanyaan
buktikan
sin a + tan a : 1 + cos = tan a
sin a + tan a : 1 + cos = tan a
2 Jawaban
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1. Jawaban tribeking22
(sin a + tan a)/(1 + cos a) = tan a
(sin a + sin a/cos a)/(1 + cos a) = tan a
[(sin a cos a + sin a)/cos a]/(1 + cos a) = tan a
[sin a(cos a + 1)/cos a]/(1 + cos a) = tan a
[sin a(1 + cos a)]/[cos a(1 + cos a)] = tan a
sin a/cos a = tan a
tan a = tan a (terbukti) -
2. Jawaban arsetpopeye
(sin a + tan a)/(1 + cos a)
= (sin a + (sin a)/(cos a)) / (1 + cos a) . (cos a)/(cos a)
= (sin a cos a + sin a) / cos a(1 + cos a)
= sin a (cos a + 1) / cos a (cos a + 1)
= (sin a) / (cos a)
= tan a