If cos A=sin B show that A+B=90°
amreen48:
cos-A 90 \sin-A-90
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solution: cosA=sin B.....(1)
therefore, cosA=sin(90-A)
equation (1)is
sin(90-A)=sin B
90-A=B
=>A+B=90
therefore, cosA=sin(90-A)
equation (1)is
sin(90-A)=sin B
90-A=B
=>A+B=90
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