What Math Function Would I Use Here?

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C

I am a beginning programmer and have been asked to create a program that asks the user to give length for a hypotenuse of a Triangle and the program is supposes to assume that the Triangle is a 30,60,90 degree triangle (right triangle) and give the other two sides.

I was given that side a=hyp*Cos(30) and b=hyp*Sin(30). Im just not sure how to use the math library functions in C. Here is my code so far:

{
float hypotenuse;

printf("Enter the length of the hypotenuse:");
scanf("%f", &hypotenuse);
printf("You have entered that the hypotenuse=%9.2f\n",hypotenuse);
}