evaluate 3 cos 55 upon 7 sin 35 - 4 cos 70 cosec 20 upon 7 10 5 degree 1025 10:45 1065 1085
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cos55°=cos(90°-35°)=sin35°
cos70°=cos(90°-20°)=sin20°
tan5°=cot85°tan25°=cot65°
=> 3sin35°/7sin35°=4(sin20°cosec20°)/7(cot85°tan85°cot65°tan65°tan45°)
=> 3/7-4/7=-1/7
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