Free Printable 2倍角・半角の公式

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2倍角・半角の公式

Total questions: 8

Worksheet time: 40secs

Name

Class

Date

1.

$\sin2\alpha=?$

a)

$2\sin\alpha\cos\alpha$

b)

$\cos^2\alpha-\sin^2\alpha$

c)

$1-2\sin^2\alpha$

d)

$2\cos^2\alpha-1$

2.

$\tan2\alpha=?$

a)

$\frac{2\tan\alpha}{1-\tan^2\alpha}$

b)

$\frac{2\tan\alpha}{1+\tan^2\alpha}$

c)

$\frac{\tan\alpha}{1-\tan^2\alpha}$

d)

$\frac{\tan\alpha}{1+\tan^2\alpha}$

3.

$\sin^2\frac{\alpha}{2}=?$

a)

$\frac{1-\cos\alpha}{2}$

b)

$\frac{1+\cos\alpha}{2}$

c)

$\frac{1-\cos\alpha}{1+\cos\alpha}$

d)

$\frac{1+\cos\alpha}{1-\cos\alpha}$

4.

$\cos^2\frac{\alpha}{2}=?$

a)

$\frac{1-\cos\alpha}{2}$

b)

$\frac{1+\cos\alpha}{2}$

c)

$\frac{1-\cos\alpha}{1+\cos\alpha}$

d)

$\frac{1+\cos\alpha}{1-\cos\alpha}$

5.

$\tan^2\frac{\alpha}{2}=?$

a)

$\frac{1-\cos\alpha}{2}$

b)

$\frac{1+\cos\alpha}{2}$

c)

$\frac{1-\cos\alpha}{1+\cos\alpha}$

d)

$\frac{1+\cos\alpha}{1-\cos\alpha}$

6.

$\cos2\alpha=?$

a)

$2\sin\alpha\cos\alpha$

b)

$\cos^2\alpha-\sin^2\alpha$

c)

$1-\sin^2\alpha$

d)

$2\cos^2\alpha+1$

7.

$\cos2\alpha=?$

a)

$2\sin\alpha\cos\alpha$

b)

$\cos^2\alpha+\sin^2\alpha$

c)

$1-2\sin^2\alpha$

d)

$1-2\cos^2\alpha$

8.

$\cos2\alpha=?$

a)

$2\sin\alpha\cos\alpha$

b)

$\sin^2\alpha-\cos^2\alpha$

c)

$1+2\sin^2\alpha$

d)

$2\cos^2\alpha-1$

100 %

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