Q. Express as a function of a DIFFERENT angle, 0∘≤θ<360∘.sin(218∘)sin(□∘)
Understand the problem: Understand the problem.We need to express sin(218∘) as a function of a different angle, which is typically done by finding an equivalent angle within the standard range of 0∘ to 360∘ that has the same sine value.
Find the reference angle: Find the reference angle.The reference angle is the acute angle that the given angle makes with the x-axis. Since 218° is in the third quadrant, we subtract it from 180° to find the reference angle.Reference angle = 218°−180°=38°.
Determine equivalent angle: Determine the equivalent angle with the same sine value.Since sine is positive in the first and second quadrants, and 218∘ is in the third quadrant, we need to find an angle in the first or second quadrant that has the same sine value as 38∘. The equivalent angle in the second quadrant is 180∘−38∘=142∘.
Express in terms of equivalent angle: Express sin(218°) in terms of the equivalent angle.We can now express sin(218°) as sin(142°) because they have the same sine value.
More problems from Find trigonometric ratios using reference angles