a²sinπ/2+abcosπ-b²tan3/4π-abcot5/4π
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![a²sinπ/2+abcosπ-b²tan3/4π-abcot5/4π](/uploads/image/z/13506057-9-7.jpg?t=a%26%23178%3Bsin%CF%80%2F2%2Babcos%CF%80-b%26%23178%3Btan3%2F4%CF%80-abcot5%2F4%CF%80)
a²sinπ/2+abcosπ-b²tan3/4π-abcot5/4π
a²sinπ/2+abcosπ-b²tan3/4π-abcot5/4π
a²sinπ/2+abcosπ-b²tan3/4π-abcot5/4π
sinπ/2=1
cosπ=-1
tan3/4π=-1
cot5/4π=1
a²sinπ/2+abcosπ-b²tan3/4π-abcot5/4π
=a^2-ab+b^2-ab
=a^2-2ab+b^2
=(a-b)^2