Answer:
Step-by-step explanation:
3×70° 45' 10''-2×40°25'10''
=210° 135'30''-80° 50'20''
=130°85'10''
=131°25'10''
Answer:
3
Step-by-step explanation:
3-9=-6 but absolute is 6
The first answer is 2.5 and I don’t know the last two sorry
If sin Ф=1/3>0 and tan Ф<0; then Ф belongs to the second quadrant and cos Ф will be negative (cos Ф<0).
sin²Ф+cos²Ф=1
(1/3)²+cos²Ф=1
1/9+cos²Ф=1
cos²Ф=1-1/9
cos²Ф=8/9
cos Ф=⁺₋√(8/9)=⁺₋2√2 / 3
We have two possible solutions.
cos Ф=2√2 / 3 This solutions is not possible, because in this case cos Ф has to be negative (cos Ф<0)
cos Ф=(-2√2) / 3 this solutions is right.
answer:B. -2 square root 2 /3 (or (-2√2) /3 )
