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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