Cos(A-B) = cosAcosB + sinAsinB
<span>
cos(</span>π/2 - θ) = cos(π/2)cosθ + sin(π/2)sinθ
π/2 = 90°
cos(π/2) = cos90° = 0. sin(π/2) = sin90° = 1
cos(π/2 - θ) = cos(π/2)cosθ + sin(π/2)sin<span>θ
</span>
= 0*cosθ + 1*sin<span>θ = </span>sin<span>θ
Therefore </span>cos(π/2 - θ) = sin<span>θ
QED </span>
Answer:
Y=10x
Step-by-step explanation:
I hope this helped you
I dont know the first answer but the 2nd is dad
Answer:
2(x) +4 = 6
2(x) +4 -4 = 6 - 4
2x = 2
2x/2 = 2/2
x = 1
Step-by-step explanation:
