513
57
75
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
1−tanxtanx=1−512512
1−51212−512=712512
= 72÷512
= 712×125=75
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