Question

Sin115°cos160° сравнить с 0

Answer 1

115⁰ - угол второй четверти. Синусы углов второй четверти положительны, то есть Sin115⁰ > 0 .

160⁰ - угол второй четверти. Косинусы углов второй четверти отрицательны, то есть  Cos160⁰ < 0 .

Sin115⁰ * Cos160⁰ = ( + )  *  ( - ) = ( - ) - < 0

Answer 2

To compare the value of sin(115°)cos(160°) with 0, we need to calculate the numerical value of sin(115°)cos(160°) and then make the comparison.

Using a scientific calculator or mathematical software, we can evaluate the sine and cosine functions for the given angles:

sin(115°) ≈ 0.9063 cos(160°) ≈ -0.9397

Now, we can multiply these two values:

sin(115°)cos(160°) ≈ 0.9063 * (-0.9397) ≈ -0.8525

The value of sin(115°)cos(160°) is approximately -0.8525.

To compare this value with 0, we can say that -0.8525 is not equal to 0.