® Radian measure = π
Chapter 5: Front Matter · MATHEMATICS · EN medium
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× Degree measure ® Degree measure = π × Radian measure ® cos (– x ) = cos x TRIGONOMETRIC FUNCTIONS ® cos ( x + y ) = cos x cos y – sin x sin y ® cos ( x – y ) = cos x cos y + sin x sin y ® sin ( π ) = cos x ® sin ( x + y ) = sin x cos y + cos x sin y ® sin ( x – y ) = sin x cos y – cos x sin y ® cos π + = – sin x sin π + = cos x cos ( π – x ) = – cos x sin ( π – x ) = sin x cos ( π + x ) = – cos x sin ( π + x ) = – sin x cos ( 2π – x ) = cos x sin ( 2π – x ) = – sin x ® If none of the angles x , y and ( x ± y ) is an odd multiple of π , then tan ( x + y ) = tan tan tan tan ® tan ( x – y ) = tan tan tan tan ® If none of the angles x , y and ( x ± y ) is a multiple of π , then cot ( x + y
📖 ncert books for class 11 maths cbsc · Page 92
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× Degree measure ® Degree measure = π × Radian measure ® cos (– x ) = cos x TRIGONOMETRIC FUNCTIONS ® cos ( x + y ) = cos x cos y – sin x sin y ® cos ( x – y ) = cos x cos y + sin x sin y ® sin ( π ) = cos x ® sin ( x + y ) = sin x cos y + cos x sin y ® sin ( x – y ) = sin x cos y – cos x sin y ® cos π + = – sin x sin π + = cos x cos ( π – x ) = – cos x sin ( π – x ) = sin x cos ( π + x ) = – cos x sin ( π + x ) = – sin x cos ( 2π – x ) = cos x sin ( 2π – x ) = – sin x ® If none of the angles x , y and ( x ± y ) is an odd multiple of π , then tan ( x + y ) = tan tan tan tan ® tan ( x – y ) = tan tan tan tan ® If none of the angles x , y and ( x ± y ) is a multiple of π , then cot ( x + y ) = cot cot cot cot ® cot ( x – y ) = cot cot cot cot ® cos x = cos x – sin x = 2cos x – = – sin x tan tan –
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