We have 112.5 = 225/2; cos112.5 < 0 because 90 < 112.5 < 180;
cos 112.5 = cos(225/2);
We use the trigonometric formula: cos(x/2) = -
![\sqrt{ \frac{1+cosx}{2} }](https://tex.z-dn.net/?f=%20%5Csqrt%7B%20%5Cfrac%7B1%2Bcosx%7D%7B2%7D%20%7D%20)
;
Then, cos(225/2) = -
![\sqrt{ \frac{1+cos225}{2} }](https://tex.z-dn.net/?f=%20%5Csqrt%7B%20%5Cfrac%7B1%2Bcos225%7D%7B2%7D%20%7D%20)
;
We have the formula: cos(270 - x) = -sinx (because cos(a-b) = cosacosb + sinasinb);
Then, cos225 = cos(270-45) = -sin45 = -
![\frac{ \sqrt{2} }{2} ;](https://tex.z-dn.net/?f=%20%5Cfrac%7B%20%5Csqrt%7B2%7D%20%7D%7B2%7D%20%3B)
Finally, cos112.5 = -
Answer:
HMMM this? im not sure i hope this will help... Solve the equation: 7x 9 x x 7. ... 7. Graph the linear system and estimate the solution. x + y = 4 x y = 8 (, ) 4. Write the slope-intercept form of the line that passes through the point (5, 5) and has ... x. Find h(g()). 4 ... Simplify the given expression.xy(xy 5xy 7y ) 6x y 4 0x y 4xy 6x y 4 5xy 7y 6x y 4 5x y 7x y d. ... B 5. x log7 log4 5.
Step-by-step explanation:
Answer:
AE = 60 units
Step-by-step explanation:
GE is one third the length of AE so...
GE = 1/3(AE)
20 = 1/3x
3(20) = (1/3x)3/1
60 = x
x = 60
AE = 60 units
Answer:
look it up
Step-by-step explanation:
Answer:
c
Step-by-step explanation:
hope it helps[]~( ̄▽ ̄)~*