Q11 of 143 Page 6

If A + B = 90° and cos B = 3/5, what is the value of sin A?

Given,


cos B = 3/5 and


A + B = 90°


So we have,


B = 90° - A


So,


cos B = cos (90° - A) = 3/5


∵ cos B = sin A


Therefore,


sin A = 3/5


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