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## Homework Statement

If cos(x) = -¾ or cos = ½ then the value of M and N in the equation Mcos^2(x) + Ncos(x) – 3 = 0 are what?

## Homework Equations

Identities I can use:

csc(x) = 1/sin(x)

cot(x) = 1/tan(x)

sec(x) = 1/cos(x)

tan(x) = sin(x)/cos(x)

cot(x) = cos(x)/sin(x)

sin^2(x) +cos^2(x) = 1

1 +tan^2(x) = sec^2(x)

1 +cot^2(x) = csc^2(x)

sin(A+B) = (sinA)(cosB) + (cosA)(sinB)

sin(A-B) = (sinA)(cosB) - (cosA)(sinB)

cos(A+B) = (cosA)(cosB) - (sinA)(sinB)

cos(A-B) = (cosA)(cosB) + (sinA)(sinB)

sin(2A) = 2(sinA)(cosA)

cos(2A) = cos^2A - sin^2A