How do you find the exact value of sin(-90)?

sin (-90) = -1 sin -90 = sin (360 - 90) = sin 270 Angle 270^@ is third quadrant, where only tan and cot are positive. Hence sin 270 = sin (180 + 90) = - sin 90 = -1

How do you find the exact value of sin(-90)?

Solve sin(90) Microsoft Math Solver

Solve sin(90) Microsoft Math Solver

How do you find the exact value of sin(-90)?

How do you prove sin(90°-a) = cos(a)?

Question Video: Finding the Value of a Trigonometric Function

Find the value of sin(90+30)

SOLUTION: T-ratios of allied angles,Mathe trigonometry formula

Why does the trigonometric function change at 90 and 270 degrees