Question

8
7 cm त्रिज्या वाले एक गोले का पृष्ठीय क्षेत्रफल ज्ञात कीजिए।​

Answer 1

Explanation:

Given:

2 \tan 45tan45 ° + \cos 60cos60 ° - \sin 30sin30 °

We have to find, the value of 2 \tan 45tan45 ° + \cos 60cos60 ° - \sin 30sin30 ° = ?

Solution:

∴ 2 \tan 45tan45 ° + \cos 60cos60 ° - \sin 30sin30 °

= 2(1) + \dfrac{1}{2}

2

1

- \dfrac{1}{2}

2

1

Using the trigonometric identity:

\tan 45tan45 ° = 1, \cos 60cos60 ° = \dfrac{1}{2}

2

1

and \sin 30sin30 ° = \dfrac{1}{2}

2

1

= 2 + \dfrac{1}{2}

2

1

- \dfrac{1}{2}

2

1

= 2

∴ 2 \tan 45tan45 ° + \cos 60cos60 ° - \sin 30sin30 ° = 2

Thus, the value of 2 \tan 45tan45 ° + \cos 60cos60 ° - \sin 30sin30 ° = 2.

Answer 2

Answer:

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