Trigonometry ratios of Angles less than 90 degree, complementary angles,sin(90°-a) =cos(a),cos(90°-a)=sin(a) ,tan(90°-a)=cot(a),cot(90°-a)=tan(a),sec(90°-a)=cosec(a),cosec(90°-a)=sec(a),special points to remember by success graph in English

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