f is a trigonometric function of the form f(x)=acos(bx+c)+d. Below is the graph of f(x). The function has a maximum point at (pi,6) and a minimum point at (−3π/4 ,2). Find a formula for f(x). Give an exact expression.

15

step-by-step explanation:

according to the triangle sum theorem, all the angles in a triangle must add up to 180 degrees. if we know one angle is already 90, we do 180-90=90. the other 2 angles must add up to 90, exactly.

step-by-step explanation:

δabc ≅ δdcb by sas because

db ≅ ac . . given (side)

bc ≅ bc . . reflexive property (side)

∠dbc ≅ ∠ acb . . alternate interior angles where transversal bc crosses parallel lines bd and ac (included angle)