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Mathematics 11 Online
OpenStudy (anonymous):

tanX= -3/4, X lies in Quadrant II, and cosY= 1/3, Y lies in Quadrant I. Find: cos(X+Y)= sin(X+Y)= tan(X+Y)=

OpenStudy (anonymous):

You have to first find angle x and y You can set up triangles of|dw:1456075283935:dw| for tan and|dw:1456075313514:dw|

OpenStudy (anonymous):

So I would first find the missing sides ( Note: these are right triangles)

OpenStudy (anonymous):

What are they?

OpenStudy (sparrow2):

|dw:1456068109026:dw|

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