4. The correct formula for cosine ratio of angle A is. 8. cos A=frac length of side adjacent to angle Alenoth of the hypotenuse c. cos A=frac eegath of the hypotenuslength of side opposite A b. cos A=frac eegath of side opposite to angle Alength of side adjacent to angle A d. cos A=frac length of side opposite to Atength of the hypotenuse