Question

Why is bituminous coal more commonly used even though anthracite is the most ideal coal for use?​

Answer 1

⇢Question:-

sin²5 + sin²10 + sin²15 + ••• + sin²85° + sin²(90°) =?

⚘Answer:-

$\large\displaystyle \red{ { \rm{{\lim_{n \to \infty } {e}^{ - n} \sum_{ \mathbb{k = 0}}^{n} \frac{ {n}^{ \mathbb{k}} }{ \mathbb{k!}} }}}}$

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⚘Explanation:-

ㅤㅤㅤ⇢ sin θ = cos (90° – θ)

ㅤㅤㅤ⇢ sin (90° – θ) = cos θ

ㅤㅤㅤㅤ∴ sin 85° = sin (90° – 5°) = cos 5°

ㅤㅤㅤㅤ∴ (sin² 5° + sin² 85°) + (sin² 10° + sin² 80°) + •••• ㅤㅤㅤㅤㅤto 8 terms + sin² 45° + sin² 90°

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ㅤㅤㅤㅤ⚘⇢ So, your answer was 9×1/2

Answer 2

Answer:

⇢Question:-

sin²5 + sin²10 + sin²15 + ••• + sin²85° + sin²(90°) =?

⚘Answer:-

.

⚘Explanation:-

ㅤㅤㅤ⇢ sin θ = cos (90° – θ)

ㅤㅤㅤ⇢ sin (90° – θ) = cos θ

ㅤㅤㅤㅤ∴ sin 85° = sin (90° – 5°) = cos 5°

ㅤㅤㅤㅤ∴ (sin² 5° + sin² 85°) + (sin² 10° + sin² 80°) + •••• ㅤㅤㅤㅤㅤto 8 terms + sin² 45° + sin² 90°

.

.

ㅤㅤㅤㅤ⚘⇢ So, your answer was 9×1/2

Explanation:

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