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
i cant read the paper please redo it and i iwll answer
Answer:
The square root of 4 is 2 because 2 times itself produces 4
2 * 2 = 4
Step-by-step explanation:
Answer:
The answer is (2x+3)(5x+2)
Assuming they mean the fraction is 24/30 the answer is 0.8 (24÷30 is the equation to use)
