cos(9π/4)+tan(-7π/6)+sin(21π)=

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cos(9π/4)+tan(-7π/6)+sin(21π)=cos(9π/4)+tan(-7π/6)+sin(21π)=cos(9π/4)+tan(-7π/6)+sin(21π)=cos(9π/4)+

cos(9π/4)+tan(-7π/6)+sin(21π)=
cos(9π/4)+tan(-7π/6)+sin(21π)=

cos(9π/4)+tan(-7π/6)+sin(21π)=
cos(9π/4)+tan(-7π/6)+sin(21π)
=cosπ/4-tan(π/6)+0
=√2/2-√3/3