16925
25169
169144
144169
Correct answer is A
Cos θ = 1213
x2 + 122 = 132
x2 = 169- 144 = 25
x = 25
= 5
Hence, tanθ = 512 and cosθ = 1213
If cos2θ = 1 + 1tan2θ
= 1 + 1(5)212
= 1 + 125144
= 1 + 14425
= 25+14425
= 16925
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