Keerthana
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यदि 5 cos T + 12 sin T = 13, तो tan T = ;

a

1312frac{13}{12}

b

1213frac{12}{13}

c

125frac{12}{5}

d

512frac{5}{12}

Answer : Option C
Explanation :

5 cosθ + 12 sinθ = 13

cosθ से भाग देने पर, 5 + 12 tanθ = 13 secθ

वर्ग करने पर, 25 + 144 tan2θ + 120 tanθ

= 169 sec2θ = 169 (1 + tan2θ)

⇒ 169 tan2θ – 144 tan2θ – 120 tan θ = 169 – 25

⇒ 25 tan2θ – 120 tan θ + 144 = 0

⇒ (5 tan θ – 12)2 = 0

⇒ 5 tan θ = 12

tanθ=125Rightarrow an heta=frac{12}{5}

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