$$\sin\frac{\pi}{10}$$ = ?

$$2\sin\frac{\pi}{20}\cos\frac{\pi}{20}$$

$$\sin\frac{\pi}{10}$$ = ?

$$2\sin\frac{\pi}{20}\cos\frac{\pi}{20}$$

формулы двойного угла Flashcards: 19 Cards (Grade 9)

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19 questions

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1.

FLASHCARD QUESTION

Front

$\cos2x$

Back

$\cos^2x-\sin^2x$

2.

FLASHCARD QUESTION

Front

$\sin2x$

Back

$2\sin x\cos x$

3.

FLASHCARD QUESTION

Front

$\sin\ 4x$

Back

$2\sin2x\cos2x$

4.

FLASHCARD QUESTION

Front

$tg\ 5x$

Back

$\frac{2tg\ 2,5x}{1-tg^2\ 2,5x}$

5.

FLASHCARD QUESTION

Front

$\frac{\sin\ 6x}{\sin3x}$

Back

$2\cos3x$

6.

FLASHCARD QUESTION

Front

$\frac{1}{7}\cos7x\sin7x$

Back

$\frac{1}{14\ }\sin14x$

7.

FLASHCARD QUESTION

Front

$\cos2\alpha=...$

Back

$1-2\sin^2\alpha$

8.

FLASHCARD QUESTION

Front

Формула $\sin2\alpha=2\sin\alpha\cos\alpha$ называется...

Back

синус двойного угла

9.

FLASHCARD QUESTION

Front

Вычислить: $2\sin\frac{\pi}{12}\cos\frac{\pi}{12}$

Back

$\frac{1}{2}$

10.

FLASHCARD QUESTION

Front

Вычислить: $\cos^215\degree-\sin^215\degree$

Back

$\frac{\sqrt[]{3}}{2}$

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