Find the exact value of cos 157.5°.
1 answer:
Cos 157.5º=-cos (180º-157.5º)=-cos 22.5=-cos(45/2) cos Ф/2=⁺₋√((1+cosФ)/2). In this case 157.5º is in the second quadrant, therefore we use the following equation: cos Ф/2=-√((1+cosФ)/2). (we will have a negative number) cos 157.5º=-cos (45/2)=-√((1+cos 45º)/2) =-√((1+√2/2)/2) =-√((2+√2)/4) =-√(2+√2) / 2 (≈-0.92387...)Answer: cos 157.5º= -√(2+√2) / 2
You might be interested in
Answer:
2
Step-by-step explanation:
To be divisible by 6, an even number must also be divisible by 3. Two of every three even numbers are <em>not</em> divisible by 3, so are not divisible by 6.
Answer:
s^2 - y^3 ........
Step-by-step explanation:
s^2 - y^3
Answer: The slope is -8/3
Step-by-step explanation: Use the slope formula y2-y1/x2-x1
so -9-7/2-(-4) = -16/6 which can be divided by 2 to get -8/3
The question is not clear here for me plz put the graph so I may answer
Answer:
84
Step-by-step explanation:
only three number are a multiple of 14
14 * 5 = 70
14 * 6 = 84
14 * 7 = 98
neither 70 nor 98 is a multiple of 4
only 84 is a multiple of 4, 7 and 14