ailiealien
ailiealien
15-05-2016
Mathematics
contestada
can i know the steps to this answer?
Respuesta :
Аноним
Аноним
15-05-2016
(cos²Ф - 1) / sin Ф * 1/sin Ф=
1(cos²Ф-1) / (sin Ф* sinФ)=
(cos²Ф-1) / sin² Ф=
--------------------------------------------------------------
Fundamental relation of trigonometry:
sin²Ф + cos²Ф=1 ⇒ sin²Ф=1-cos²Ф ⇒
-sin²Ф=cos²Ф-1
--------------------------------------------------------------
-sin²Ф/sin²Ф=1
Answer:
(cos²Ф - 1) / sin Ф * 1/sin Ф=-1
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