Which function is an odd function? A. f(x) = cos(-2pi x)
B. f(x) =csc(-3pi/2 x)
C. f(x) = sec (5pi/3 x)
D. f(x) = cos(6pi/5 x)

Sine is an odd function, and cosine is an even function.

(sin 42)/31. = sinx)/37

sinx = 37 (sin42)/31

= 37× 0.66/31 = 0.787

x= 51.9

other angle opposite to y = 180-51.9-42

= 180- 93.9 =86.1

so

sin42)/31 = sin 86.1)/y

0.021 = 0.997 /y

y= 0.997/0.021 =47.47

you didn't give me the choices, so i will just give you the graph so you can look at your choices and choose the right one.