Practicing Success
If sinθ + cosθ = \(\frac{17}{13}\); and 0<θ<90°, then value of (sinθ - cosθ) is? |
\(\frac{3}{13}\) \(\frac{10}{13}\) \(\frac{11}{13}\) \(\frac{7}{13}\) |
\(\frac{7}{13}\) |
sinθ + cosθ = \(\frac{17}{13}\) --- (i) Now, let sinθ - cosθ = x -----(ii) squaring and adding eqn (i), (ii) 2(sin2θ + cos2θ) = \(\frac{289}{169}\) + x2 ⇒ x2 = 2 - \(\frac{289}{169}\) = \(\frac{338 - 289}{169}\) ⇒ x2 = \(\frac{49}{169}\) ⇒ x = \(\frac{7}{13}\) |