Answer:
•cos(s+t) = cos(s)cos(t) - sin(s)sin(t) = (-⅖).(-⅗) - (√21 /5).(⅘) = +6/25 - 4√21 /25 = (6-4√21)/25
•cos(s-t) = cos(s)cos(t) + sin(s)sin(t) = (-⅖).(-⅗) + (√21 /5).(⅘) = +6/25 + 4√21 /25 = (6+4√21)/25
cos(t) = ±√(1 - sin²(t)) → -√(1 - sin²(t)) = -√(1 - (⅘)²) = -⅗
sin(s) = ±√(1 - cos²(s)) → +√(1- cos²(s)) = +√(1 - (-⅖)²) = √21 /5
Answer:
c is the correct answer for this question
Step-by-step explanation:
c is the correct answer for this question
А
1.5
2.5
© 2
V3
Hope this helps.
It’s green:b purple:d blue:c red:a because
Answer:
Formula for circumference of a circle;
C = 2πr
To find the radius, we must find half(1/2) of the diameter.
Since we are given 6, we would find 1/2 of 6 which is <u>3</u>.
Now let's plug in these values into the formula:
C = 2πr
C = 2 x 3.14 x 3
C = 18.84 feet
