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tamaranim1 [39]
3 years ago
10

Determine for which interval(s) the function is increasing and decreasing for questions 3-5.

Mathematics
1 answer:
Solnce55 [7]3 years ago
7 0
Option D would be the correct answer.
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3 years ago
Find an exact value. Cos 75° negative square root of six plus square root of two quantity square root of six minus square root o
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Answer:

√2(√3 - 1)/4

Step-by-step explanation:

To find an exact value for Cos75°, we use the compound angle formula. Since 75° = 45° + 30°, Cos75° = Cos(45° + 30°).

Using Cos(A + B) = CosACosB - SinASinB where A = 45° and B = 30°,  

Cos75° = Cos(45° + 30°) = Cos45°Cos30° - Sin45°Sin30°

Now Cos45° = Sin45° = 1/√2 = √2/2, Cos30° = √3/2 and Sin30° = 1/2.

Substituting these values into the above equation, we have

Cos75° = Cos(45° + 30°)

= Cos45°Cos30° - Sin45°Sin30°

= √2/2 × √3/2 -  √2/2 × 1/2

= √6/4 -√2/4

= √2(√3 - 1)/4

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3 years ago
Pls help,its for my sister
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