Ta có M = sin50° + cos70° + cos110° – sin130°. = sin50° + cos70° + cos(180° – 70°) – sin (180° – 50°) = sin50° + cos70° – cos70° – sin50°. = (sin50° – sin50°) + (cos70° – cos70°) = 0 + 0. = 0. Vậy ta chọn phương án C. Gói VIP thi online tại VietJack (chỉ 200k/1 năm học), luyện tập gần 1
Explanation: For sin 60 degrees, the angle 60° lies between 0° and 90° (First Quadrant ). Since sine function is positive in the first quadrant, thus sin 60° value = √3/2 or 0.8660254. . . ⇒ sin 60° = sin 420° = sin 780°, and so on. Note: Since, sine is an odd function, the value of sin (-60°) = -sin (60°).
Equation with sine. The calculator has a solver which allows it to solve equation with sine of the form cos (x)=a. The calculations to obtain the result are detailed, so it will be possible to solve equations like sin(x) = 1 2 sin ( x) = 1 2 or 2 ⋅ sin(x) = 2–√ 2 ⋅ sin ( x) = 2 with the calculation steps.
A 1.2 m tall girl spots a ballon moving with the wind in a horizontal line at a height of 88.2 m from the ground. The angle of elevation of the balloon from the eyes of the girl at any instant is 60°. After some time, the angle of elevation reduces to 30° then the distance travelled by the balloon during the interval is
The math.sin () method returns the sine of a number. Note: To find the sine of degrees, it must first be converted into radians with the math.radians () method (see example below).
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jeśli m sin 50 to
