Respuesta :

sardulahmed152

Answer:

Step-by-step explanation:

cos theta = root (1-sin^2theta)

so... cos theta = root (1-root23/12)

simplify and get ur answer

devishri1977

Answer:

Step-by-step explanation:

(sin Ф)² + (Cos Ф)² = 1

(√23/12)² + (cos Ф)² = 1

(cos Ф)² = 1 - (√23)²/(12)²

             [tex]=1-\frac{23}{144}\\\\=\frac{144}{144}-\frac{23}{144}\\\\=\frac{144-23}{144}\\\\=\frac{121}{144}\\\\[/tex]

Cos Ф = √(121/144)

            Cos Ф = 11/12