Question

prove that
Cos 9° - Sin 9°/ cos9°+ sin 9° = Tan 36°
​

Answer 1

Step-by-step explanation:

Cos 9° - Sin 9°/ cos9°+sin 9°

cos 9° /cos 9° + - sin 9° / cos 9°

cos 9 ° / cos 9° + sin 9° / sin 9°

1 + - tan 9 °/ 1 + tan 9 °

tan 45° - tan 9 ° / 1 + tan 45° tan 9 °

tan (45° - 9 ° )

tan 36 °

hence proved .....

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