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Mathematics 12 Online
OpenStudy (anonymous):

If α and B are the measures of two first quadrants angles and sinα=4/5 and sin B= 5/13 find sin (α+B)

OpenStudy (amistre64):

the formula for sin(a+b) is: sin(a)cos(b) + sin(b)cos(a)

OpenStudy (amistre64):

you can draw up 2 triangles to define all your cosines with from your sine definitions

OpenStudy (anonymous):

how do i find cos α and B

OpenStudy (anonymous):

in some cases with ur calculator others with the great unit circle... :P

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