sqrt(2)sin(90-15)-sqrt(2)sin(15)=sqrt(2)(cos15-sin15)=sqrt(2)(cos(45-30)-sin(45-30))=
=sqrt(2)(cos45cos30+sin45sin30-sin45cos30+sin30cos45=2sin45sin30)=1
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sqrt(2)sin(90-15)-sqrt(2)sin(15)=sqrt(2)(cos15-sin15)=sqrt(2)(cos(45-30)-sin(45-30))=
=sqrt(2)(cos45cos30+sin45sin30-sin45cos30+sin30cos45=2sin45sin30)=1