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Trigonometric Ratios of Multiples of an Angle

2sinacosa-cos...

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2sinacosa-cosa/1-sina+sin^2a-cos^2a is equal to

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\frac{sin 2 A}{sin A} - \frac{cos 2 A}{cos A} = sec A

\frac{s i n A + c o s A}{s i n A - c o s A} + \frac{s i n A - c o s A}{s i n A + c o s A} = \frac{2}{s i n^{2} A - c o s^{2} A}

\frac{1 + sin 2 A}{cos 2 A} = \frac{cos A + sin A}{cos A - sin A} = cot (\frac{π}{4} - A)

Q. If sin²A + cos²A =1 then sin⁴A + cos⁴A will also be equal to 1. Or sinA +cosA will also be equal to 1.

$I f s i n y = x s i n (a + y), t h e n \frac{d y}{d x} =$

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Trigonometric Ratios of Multiples of an Angle

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