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
Perimeter= 2 ( length + width)
2×(12+6)
2×18
=36
2x16
4x8
And of course 1x32
X = - 0.09
x = 1.76
Are the two possible values for X
Answer:
550.16 km
Step-by-step explanation:
the percentage multiplier is 0.712
772.69 x 0.712 = 550.15528
to 2dp 550.16km
