Answer:
x = 90°
Step-by-step explanation:
Using the identity
cos²x = 1 - sin²x
Given
cos²x - sin x + 1 = 0
1 - sin²x - sin x + 1 = 0
- sin²x - sin x + 2 = 0 ← quadratic equation in sin x ( multiply through by - 1 )
sin²x + sin x - 2 = 0 ← in standard form
(sinx + 2)(sinx - 1) = 0 ← in factored form
Equate each factor to zero and solve for x
sinx + 2 = 0 ⇒ sinx = - 2 ← has no solution as - 1 ≤ x ≤ 1
sinx - 1 = 0 ⇒ sinx = 1 ⇒ x = 90°
solution is x = 90°
You can fit 15 2cm in a 600mm by 500mm.
<u>Answer:</u>
a. the error is that he wrote 0.05 instead of 0.2
0.148835 ≈ 0.2
b.
0.2 = 2 × 0.1
0.2 = 2 × 10⁻¹
The mass is about 2 × 10⁻¹ kg
Answer: 23+32-3×4-52÷5+(7×4)= 60.6
Step-by-step explanation:
C) 5x² and D) 6x².
The box on the top left would be filled with -2x³; top right would be filled with 5x²; second left would be filled with 6x²; second right would be filled with -15x; bottom left would be filled with -8x; and bottom right would be filled with 20.