trignometry

Asked by  | 27th Jan, 2009, 08:17: PM

Expert Answer:

When A and B are complementary angles, i.e. when their sum is 90 degrees, then,

 sinA = cosB

 and

cosA=sinB

So,

cosB=sinA=4/5

 

Answered by  | 27th Jan, 2009, 11:43: PM

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