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Given that cos x = 1213, evaluate \(\frac{1 - \...

Given that cos x = 1213, evaluate 1tanxtanx

A.

513

B.

57

C.

75

D.

135

Correct answer is C

cos x1213

132 = 122 + a2

169 = 144 + a2

a2 = 169 - 144

a2 = 25

a 25

a = 5

tan x = 512

1tanxtanx=1512512

151212512=712512

= 72÷512

= 712×125=75