2007-01-15 13:27:32 · 5 answers · asked by Anna H 1 in Science & Mathematics ➔ Mathematics
You mean sin(3pi/4)
it lies in second quadrant where sine is having a positive value
hence its value is
sin(pi-pi/4)=sin(pi/4)=
1/sqrt(2)
2007-01-15 14:23:47 · answer #1 · answered by WhItE_HoLe 3 · 0⤊ 0⤋
Assuming Ï=3.14 (though actually Ï is not exactly equal to 3.14)
sin 3*3.14/4 = sin(3Ï/4)
=sin(Ï - Ï/4)
Now,because sin(Ï- A)=sinA
therefore,we have :
sin(Ï-Ï/4)=sin(Ï/4) (Note that there is no negative sign as sinA is positive when A lies in the first or second quadrant )
Therefore,
sin(Ï/4)= 1/â2 =1.414(approximately) ,
which is your required answer.
2007-01-16 14:21:32 · answer #2 · answered by HIMANSHU A 1 · 0⤊ 0⤋
sin (3Ï/4) = sin(Ï/4) = 1/â2. This is one of the exact values you should know.
2007-01-15 21:41:52 · answer #3 · answered by Scarlet Manuka 7 · 0⤊ 0⤋
the correct answer is 1/2.
2007-01-18 01:15:36 · answer #4 · answered by subrat_2k6das 1 · 0⤊ 0⤋
one by root two.
sin of three pi by four is the same as sin forty five.
2007-01-15 22:11:43 · answer #5 · answered by okhla99 1 · 0⤊ 0⤋