Find the exact value of sin 135°. Solution: Since, we know that sin is positive in the 1st and 2nd Quadrant, here, 135° lies in the 2nd Quadrant, then By the Trigonometric Identity of

Method 210° = 180° + 30° This means that ∅ is 30° below the x axis in the 3rd quadrant. Sin (30) = 1/2 In the third quadrant, the sine is minus. so sin (210°) = - 1/2 <<<<<<<

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One plus one is two.

The exact value of sin(45) sin ( 45) is √2 2 2 2. √2 2 cos(30)− cos(45)sin(30) 2 2 cos ( 30) - cos ( 45) sin ( 30) The exact value of cos(30) cos ( 30) is √3 2 3 2. √2 2 ⋅ √3 2 −cos(45)sin(30) 2 2 ⋅ 3

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As we know, tan is the ratio of sin and cos, such as tan θ = sin θ/cos θ. Thus, we can get the values of tan ratio for the specific angles. Sin Values. sin 0° = √(0/4) = 0. sin 30° = √(1/4) = ½. sin 45° = √(2/4) = 1/√2. sin 60° = √3/4 = √3/2. sin 90° =

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