Question

Sin(-390) решите .................

Answer 1

Sin-(390)=-sin390= - sin(360+30)= - sin30 = -0,5

Answer 2

Solution for sin(-390)

To solve sin(-390), we can use the periodicity of the sine function. The sine function has a period of 360 degrees, which means that sin(x) = sin(x + 360k) for any integer k. Therefore, we can find an equivalent angle within the range of -360 to 0 degrees and use the properties of the sine function to find the value of sin(-390).

Using the periodicity of the sine function, we can rewrite sin(-390) as sin(-390 + 360) to find an equivalent angle within the range of -360 to 0 degrees.

sin(-390) = sin(-390 + 360)

Now, we can simplify the expression inside the sine function to find an equivalent angle within the range of -360 to 0 degrees.

sin(-390) = sin(-30)

Now, we can find the value of sin(-30) using the properties of the sine function.

The sine function is an odd function, which means that sin(-x) = -sin(x) for any angle x.

sin(-30) = -sin(30)

From the given information, we know that sin(30) = 0.267 Therefore,

sin(-30) = -0.267

So, the value of sin(-390) is -0.267.