Q. If tanA=1160 and sinB=53 and angles A and B are in Quadrant I, find the value of tan(A+B).Answer:
Given Tangent Formula: We know that the tangent of a sum of two angles A and B is given by the formula:tan(A+B)=1−tanA⋅tanBtanA+tanB.We are given tanA=1160. We need to find tanB to use this formula.
Find Tangent B: To find tanB, we need to use the identity sin2B+cos2B=1 to find cosB, since tanB=cosBsinB.We are given sinB=53. Let's find cosB.(sinB)2+(cosB)2=1(53)2+(cosB)2=1259+(cosB)2=1
Use Trigonometric Identity: Subtract 259 from both sides to isolate (cosB)2.(cosB)2=1−259(cosB)2=2516Since B is in Quadrant I, where cosine is positive, we take the positive square root.cosB=2516cosB=54
Calculate Tangent B: Now we can find tanB using sinB and cosB.tanB=cosBsinBtanB=4/53/5tanB=43
Calculate Tangent A+B: We can now use the values of tanA and tanB to find tan(A+B).tan(A+B)=1−tanA⋅tanBtanA+tanBtan(A+B)=1−(1160⋅43)1160+43
Find Common Denominator: First, we need to find a common denominator to add 1160 and 43. The common denominator is 44. tan(A+B)=(1160⋅44+43⋅1111)/(1−1160⋅43)tan(A+B)=(44240+4433)/(1−44180)
Simplify Numerators: Now we add the numerators and simplify the expression.tan(A+B)=44240+33/(1−44180)tan(A+B)=44273/(1−44180)
Simplify Denominator: Next, we simplify the denominator.1−44180=4444−441801−44180=−441361−44180=−1134 (simplifying by dividing both numerator and denominator by 4)
Divide Numerators: Now we can divide the numerators by the denominator.tan(A+B)=44273/11−34To divide by a fraction, we multiply by its reciprocal.tan(A+B)=44273×−3411
Final Calculation: Multiply the numerators and the denominators.tan(A+B)=44×−34273×11tan(A+B)=−14963003tan(A+B)=−14963003 (it is conventional to write negative sign in the numerator)
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