What is equivalent to the value of sin(A+B) if sinA = cosB? I know the answer is 1. I just can't see how to get their using the trig identities.
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Originally Posted by MATNTRNG What is equivalent to the value of sin(A+B) if sinA = cosB? I know the answer is 1. I just can't see how to get their using the trig identities. If sinA=cosB, then cosA=sinB also. Why? Expanding sin(A+B) then leads to $\displaystyle cos^2B+sin^2B$ or $\displaystyle sin^2A+cos^2A$
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