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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)
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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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