sin{[(4n-1)/4]π-a}·cos{{(4n+1)/4}π-a} 化简
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sin{[(4n-1)/4]π-a}·cos{{(4n+1)/4}π-a}化简sin{[(4n-1)/4]π-a}·cos{{(4n+1)/4}π-a}化简sin{[(4n-1)/4]π-a}·cos
sin{[(4n-1)/4]π-a}·cos{{(4n+1)/4}π-a} 化简
sin{[(4n-1)/4]π-a}·cos{{(4n+1)/4}π-a} 化简
sin{[(4n-1)/4]π-a}·cos{{(4n+1)/4}π-a} 化简
积化和差公式
sin{[(4n-1)/4]π-a}·cos{{(4n+1)/4}π-a}
={sin([(4n-1)/4]π-a+[(4n+1)/4]π-a)+sin([(4n-1)/4]π-a-[(4n+1)/4]π+a)}/2
=(-sin2a-1)/2
=-1/2-sinacosa
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