Question

when are sine and cosine equal

Answer 1

45 degrees (pi/4).

A right angle with an angle of 45 degrees will be a 45-45-90 triangle.
Equal angles give equal sides.
If the hypotenuse is length r, and the sides are length s, then sin(45) = opp/hyp = s/r
cos(45) = adj/hyp = s/r
sin(x) and cos(x) are equal for 45 degrees.

Another way of solving is to say
sin(x) = cos(x)
sin(x)/cos(x) = 1
tan(x) = 1
x = arctan(1)

x = 45 degrees

Since tan(x) is positive in Quadrant III another valid angle is
180 + 45 =
225 degrees

To be even more specific for any angle
180(n-1) + 45 where n is a positive integer, sin(x) and cos(x) are equal

Answer 2

0.0

Answer 3

wut?

Answer 4

goodbye

Answer 5

well, always since the range of both is continuous from -1 to 1

Answer 6

soooo

Answer 7

so for any given value of a sine function; you can find an equal value of a cosine function.

Answer 8

thts the answer?

Answer 9

according to what you have posted ..... yes.

Answer 10

"when are sine and cosine equal"

for any given value of a sine function; you can find an equal value of a cosine function.

Answer 11

do you know which valuse r always less then 1

Answer 12

values

Answer 13

if you meant to ask: when is sin(x) equal to cos(x)

then so derivation of 45 degrees is suitable