If sina
sinA and cot B is equal to 1, prove that
sin (A+B)=1, where A and B both are acute
angle

Hello i need some with trigonometric substitutions. [tex]\int\limits^a_b {x} \, dx[/tex]

If there are 12 moths and some have 31 days and others have 30 days how many have 28 days?

Afrequency table of grades has five classes (a, b, c, d, f) with frequencies of 3, 13, 14, 5, and 3 respectively. using percentages, what are the relative frequencies of the five classes?