Answer:
cosA = -
Step-by-step explanation:
Using the double angle identity
cos2A = 2cos²A - 1 , then
cosA = 2cos²( ) - 1 , that is
cosA = 2 × ( )² - 1
= 2 × - 1
= -
= -
Answer:
y=2 x=5
Step-by-step explanation:
3x-2y=11
2x-3y=4
you multiply both equations to cancel one variable out. in this case you multiply the first equation by 2 and the second by -3
6x-4y=22
+ -6x-9y=12
--------------------------
0x+5y=10
y=2
you plug that in either equation
3x-2(2)=11
3x-4=11
3x=15
x=5
Answer:
10
Step-by-step explanation:
the formula is a^2+b^2 =c^2
so you do 8x8 which is 64
and 6 x 6 which is 36
then you add them together which is 100 and then you square root that which is 10
Answer:
4.3
Step-by-step explanation:
Answer:
Dude where is the picture
Step-by-step explanation:
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