Question

for a particular angle theta, the cosine function f(x) = a cos b(theta) has the following values within one cycle of the function...:- f(0) = 2, f(pi/4) = 0, f(pi/2) = -2, f(3pi/4) = 0, f(pi) = 2

what is the rule for the cosine function???

Answer 1

@abb0t

Answer 2

@dumbcow

Answer 3

@dumbcow

Answer 4

ok so you need to find a,b
you are given 5 points ... plug them in and yo will end up with 5 equations containing a and b
you really only need 2 to solve for a,b

Answer 5

or you could also plot the points and analyze the graph to determine a,b which represent
a -> amplitude
b-> frequency ...... period = 2pi/b

Answer 6

k so if i take f(pi/4) so = a cos b (theta) = 0...?