Question

Вычислить sin(-315°)​

Answer 1

$sin(-315^\circ )=-sin315^\circ =-sin(360^\circ -45^\circ )=-sin(-45^\circ )=sin45^\circ =\frac{\sqrt2}{2}$

Answer 2

sin(-315°)​=-sin(315°)​=-sin(270°+45°)=-(-сos45°)=√2/2

Answer 3

To calculate the sine of an angle in degrees, we can use a scientific calculator or mathematical software. For sin(-315°), we can proceed as follows:

sin(-315°) = sin(360° - 315°)

Since the sine function has a period of 360°, sin(360° - 315°) is equivalent to sin(45°). Now, we just need to find the sine value of 45°.

sin(45°) = 0.70710678118 (approximately)

So, sin(-315°) is also approximately equal to 0.70710678118.