sec70°sin20°-cos20°cosec70°
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Sec70°×sin20°-cos20°xcosec70°
=1/cos70°×sin20°-cos20°x1/sin70°
=sin20°/cos°70-cos20°/sin70°
=sin20°/sin(90-70)°-cos20°/cos(90-70)°
=sin20°/sin20°-cos20°/cos20°
=1-1
=0
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