Question

can anybody help?

Answer 1

@ikram002p can you help me with this?

Answer 2

hint : sin(A+B) formula

Answer 3

that's sin(x+pi/5) right?

Answer 4

Yep !

Answer 5

how do i know that x=7pi/15 ?

Answer 6

\[\large \sin (x+\frac{\pi}{5}) = \frac{\sqrt{3}}{2}\]

Answer 7

take inverse sin both sides

Answer 8

\[\large x+\frac{\pi}{5} = \arcsin (\frac{\sqrt{3}}{2})\]

Answer 9

\[x + \frac{\pi}{5} = \frac{\pi}{3} + 2n\pi , ~ \left(\pi - \frac{\pi}{3}\right) + 2n\pi \]

Answer 10

plugin n = 0 and solve x

Answer 11

ohh got it..thanks a lot! :)

Answer 12

np :)