结果是-2
过程如图
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手机提问的朋友在客户端右上角评价点【满意】即可
sin (25π/6)-cos (23π/3)+tan (-25π/4)-sin^2 (π/5)-sin^2 (3π/10)
=sin (4π+π/6)-cos (8π-π/3)+tan (-6π-π/4)-sin^2 (π/5)-sin^2 (3π/10)
=sin(π/6)-cos (π/3)+tan (-π/4)-sin^2 (π/5)-sin^2 (3π/10)
=1/2-1/2-1-sin^2 (π/5)-sin^2 (3π/10)
=-1-sin^2 (π/5)-sin^2 (3π/10)
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