1-cosA + sin A / sinA + cosA - 1 = 1+ sinA/cosA
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Step-by-step explanation:
1-cosA+sinA/sinA+cosA-1=1+sinA/cosA
1-cosA+1+cosA-1=1+tanA
1=1+tanA
tanA=0
tanA=tan0°
A=0
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