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Mathematics 23 Online
OpenStudy (anonymous):

.

OpenStudy (alekos):

just draw a right angled triangle with 3 as the hypotenuse and 1 as the opposite side to theta. then work out the last side and hence cos (theta)

OpenStudy (raden):

extra info : if sin > 0 and tan < 0 then the Θ is in the 2nd quadrant. so cos Θ must be negative

OpenStudy (alekos):

yes it is

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