If (tanθ + secθ) = 7, θ is acute angle than find the value of 5sinθ.
Answer & explanation
Correct answer: option 4
sec2θ - tan2θ = 1
(secθ + tanθ)(secθ - tanθ) = 1
(7)(secθ - tanθ) = 1
(secθ - tanθ) = \(\frac{1}{7}\)
secθ + tanθ = 7 ...(i)
secθ - tanθ = \(\frac{1}{7}\) ...(ii)
Adding eq. (i) and (ii)
2secθ = \(\frac{50}{7}\)
secθ = \(\frac{25}{7}\)=\(\frac{H}{B}\)
P = 24
5sinθ = 5×\(\frac{24}{25}\)
= \(\frac{24}{5}\)