document.write( "Question 1151437: If 0 < A < 90 degrees, prove geometrically that cos(A-90°) = sinA \n" ); document.write( "

Algebra.Com's Answer #773177 by ikleyn(52802) $\"\"$ $\"About$

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document.write( "For it, draw the unit circle in a coordinate plane, mark the angle A in it and then use definitions of sine and cosine.\r\n" );
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