求值sin13 π/4+cos(-3π/4)+tan7π/4
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求值sin13 π/4+cos(-3π/4)+tan7π/4
求值sin13 π/4+cos(-3π/4)+tan7π/4
求值sin13 π/4+cos(-3π/4)+tan7π/4
sin13 π/4+cos(-3π/4)+tan7π/4
=sin(4π-3π/4)+cos(3π/4)+tan(π+3π/4)
=-sin3π/4+cvos3π/4+tan3π/4
=-√2/2-√2/2+(-1)
=-√2-1
故有sin[(a-b)/2]=根号(49/130)=7/(根号130) Sin(α+3/4π)= 5/13 -π/4< α <π/4 π/2<α+3/4π<π cos(α+3/4π)
求值sin13 π/4+cos(-3π/4)+tan7π/4
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