Question

Solve que no. 13
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Answer 1

Answer:

cos 75°

Step-by-step explanation:

cos 30° cos 45° - sin 30° sin 45°

use: cos A cos B - sin A sin B = cos( A+ B)

Here A = 30° and B = 45°

cos 30° cos 45° - sin 30° sin 45°

= cos(30° + 45°)

= cos 75°

Answer 2

Answer:

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