Question 1194315
 If tan A = ¾ and cos B = 12/13, find
a. Tan (A  -  B)
b. c. tan ( B  -  A )
c. Sin ( A + B)
d. cos 2A
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tan(A) = 3/4
tan = y/x
r = sqrt(x^2 + y^2) = 5
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sin = y/r
cos = x/r
cot = 1/tan
sec = 1/cos
csc = 1/sin
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cos(B) = 12/13 = x/r ---> y = 5
sin = y/r
cos = x/r
tan = y/x
cot = 1/tan
sec = 1/cos
csc = 1/sin
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a. Tan (A  -  B)
b. c. tan ( B  -  A )
c. Sin ( A + B)
d. cos 2A
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Look up formulas at Wikipedia "Half angle formulas"
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