Buktikan Identitas trigonometri brkt: Cot2 a / 1+cot2 a = cos2 a Tolong bantu dijawab yaa..

(cot² a) / (1 + cot² a)

= ((cos² a)/sin² a) / (1 + cos² a/sin² a)

= (cos² a/sin² a) / ((sin² a + cos² a)/sin² a)

= (cos² a/sin² a) / (1/sin² a)

= (cos² a/sin² a) . sin² a

= cos² a

Terbukti

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Kelas 10

Pelajaran Matematika

Bab 6 Trigonometri Dasar

Kata kunci : –

Kode kategorisasi : 10.2.6