Answer:
The value of cos Ф is ± 
Step-by-step explanation:
There are important rules for sin Ф and cos Ф
∵ sin Ф = 
∴ sin²Ф = 
∴ sin²Ф = 
→ By using the third rule above
∵ cos²Ф = 1 - sin²Ф
∴ cos²Ф = 1 - 
∴ cos²Ф = 
→ Take square root for both sides
∴ cos Ф = ± 
∴ The value of cos Ф is ± 
A = D/BC. In order to isolate A, all you do is divide by BC
Answer:
It's -3 mate
Step-by-step explanation:
I just did the test
Answer:
The slope is Undefined.
Step-by-step explanation:
Answer:
21
Step-by-step explanation:
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