SOLUTION: if sin alpha =2/3 for pi/2≤alpha≤pi and cos beta =-5/7 for pi≤beta≤3pi/2, find the value of cos(alpha+beta)
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Question 873143: if sin alpha =2/3 for pi/2≤alpha≤pi and cos beta =-5/7 for pi≤beta≤3pi/2, find the value of cos(alpha+beta) Answer by lwsshak3(11628) (Show Source):
You can put this solution on YOUR website! if sin alpha =2/3 for pi/2≤alpha≤pi and cos beta =-5/7 for pi≤beta≤3pi/2, find the value of cos(alpha+beta)
*** (in quadrant II in which sin>0, cos<0)
.. (in quadrant III in which sin<0, cos<0)
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