Q. The angle θ1 is located in Quadrant II, and cos(θ1)=−2922.What is the value of sin(θ1) ? Express your answer exactly.sin(θ1)=
Quadrant II and Pythagorean Identity: We know that in Quadrant extII, the sine function is positive, and we can use the Pythagorean identity extsin2(θ)+extcos2(θ)=1 to find the value of extsin(θ).
Substituting cos(θ1) into the Identity: First, we substitute the given value of cos(θ1) into the Pythagorean identity.sin2(θ1)+(−2922)2=1
Calculating the Square of cos(θ1): Next, we calculate the square of cos(θ1).(−2922)2=841484
Substituting the Value Back into the Identity: Now, we substitute this value back into the Pythagorean identity. sin2(θ1)+841484=1
Solving for sin2(θ1): We then solve for sin2(θ1).sin2(θ1)=1−841484
Subtracting the Fraction from 1: Subtracting the fraction from 1 gives us:sin2(θ1)=841841−841484
Simplifying the Subtraction: Simplifying the subtraction, we get: sin2(θ1)=841841−484
Performing the Subtraction in the Numerator: Performing the subtraction in the numerator gives us: sin2(θ1)=841357
Taking the Positive Square Root: Since we are looking for sin(θ1) and we know it should be positive in Quadrant II, we take the positive square root of the result.sin(θ1)=841357
Simplifying the Square Root: Simplifying the square root, we find that 841 is a perfect square, being 292, so:sin(θ1)=29357
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