(sin45°/cos45°)^2+(cos45°/sin45°)^2-4 cos^2 45°=?
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sin45°=cos45°=1/root2
therefore sin45/cos45=1
or cos45/sin45=1
now 1^2+1^2-4×(1/root2)^2
:1+1-2
:0
therefore sin45/cos45=1
or cos45/sin45=1
now 1^2+1^2-4×(1/root2)^2
:1+1-2
:0
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