If we are given an expression like
@ = cos^-1 (36 - 25 (cos 135')) / 62
where @ means theta. Then how to find the value of @
2006-12-28 02:40:32 · 8 answers · asked by anurag 1 in Science & Mathematics ➔ Mathematics
This expression is probably not correct. The argument of a cos-1 function cannot exceed +1 or be below -1. Further, cos 135 is definitely below 1 in magnitude, so, 36-25cos135 is well above 9, and hence there is something erroneous in the expression...
2006-12-29 20:29:15 · answer #1 · answered by Simple guy 2 · 0⤊ 0⤋
First, multiply by 62. Then
62θ = cos^-1(36 + 25*â2/2)
because cosine of 135 degrees = -cos 45 degrees = -â2/2.
Now take the cosine of both sides
cos(62θ) = 36 + 25â2/2.
Since the right side of this equation is bigger than 1,
no real angle can satisfy it. The cosine of a
real angle <=1 always.
BTW I got the θ by copying the symbol from the
character map and pasting it in.
2006-12-28 04:08:27 · answer #2 · answered by steiner1745 7 · 0⤊ 0⤋
it is approximately equal to 1
2006-12-30 05:37:56 · answer #3 · answered by Rajaram 1 · 0⤊ 0⤋
Ask Ure teacher.
2006-12-28 03:13:04 · answer #4 · answered by roughdude_16 2 · 1⤊ 1⤋
MY dear friend refer your books or take the guidance of your teacher
2006-12-28 04:11:38 · answer #5 · answered by ram kumar 2 · 1⤊ 1⤋
Just can tell u that @ is theta !
2006-12-28 03:04:23 · answer #6 · answered by Catalyst 3 · 0⤊ 1⤋
I would suggest a calculator.......
2006-12-28 03:12:37 · answer #7 · answered by a_math_guy 5 · 0⤊ 1⤋
Please give me time.
2006-12-28 03:20:11 · answer #8 · answered by Paper P 1 · 1⤊ 0⤋