Answer on Trigonometry Question for Akhtar Rasool khan
where sine and cosine curve meet
(sin x / cos x) - 1 = 0
Instead of the ratio "sin x / cos x', we'll use the resulting function, tg x.
The obtained equation is an elementary equation.
tg x - 1 = 0
tg x = 1
x= arctg 1 +k*pi
So, x= pi/4 + k*pi.
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