tan(-11π/4﹚-cos﹙-11π/4﹚的符号?

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tan(-11π/4﹚-cos﹙-11π/4﹚的符号?
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tan(-11π/4﹚-cos﹙-11π/4﹚的符号?
tan(-11π/4﹚-cos﹙-11π/4﹚的符号?

tan(-11π/4﹚-cos﹙-11π/4﹚的符号?
tan (-11π/4) - cos(-11π/4)
=tan (π/4) + cos(π/4)
=1+√2/2 >0