$\frac{d^{20} y}{d x^{20}} (2 cos x cos 3 x)$ is equal to

2^{20} (cos 2 x - 2^{20} cos 4 x)

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2^{20} (cos 2 x + 2^{20} cos 4 x)

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2^{20} (sin 2 x + 2^{20} sin 4 x)

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2^{20} (sin 2 x - 2^{20} sin 4 x)

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\frac{d^{20}}{d x^{20}} (2 \cos x \cos 3 x) =

(a) 2²⁰ (cos 2 x − 2²⁰ cos 4 x)
(b) 2²⁰ (cos 2 x + 2²⁰ cos 4 x)
(c) 2²⁰ (sin 2 x + 2²⁰ sin 4 x)
(d) 2²⁰(sin 2 x − 2²⁰ sin 4 x)

\frac{d^{20} y}{d x^{20}} (2 cos x cos 3 x)

is equal to

Q. Find the value of

\frac{d^{20}}{d x^{20}} (2 cos x cos 3 x)

x = π

Q. ABCD in which a b is equals to 6 centimetre BC is equals to 5 cm angle A is equals to 55 degree angle b is equals to 110 degree and Angle B is equals to 90 degree solver with the diagram

Find answers to the following. Write and indicate how you solved them.
(i) Is $\frac{5}{9}$ equal to $\frac{4}{5}$ ?
(ii) Is $\frac{9}{16}$ equal to $\frac{5}{9}$ ?
(iii) Is $\frac{4}{5}$ equal to $\frac{16}{20}$ ?
(iv) Is $\frac{1}{15}$ equal to $\frac{4}{30}$ ?

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d20ydx20(2cosxcos3x) is equal to

$\frac{d^{20} y}{d x^{20}} (2 cos x cos 3 x)$ is equal to