To write the trigonometric equation   y = ½ cos(A + B)

Open the equation editor

When the box opens write y  =

From the fraction and radical template, choose the fraction template

Insert the 1 on top, the numerator

Move to the denominator by using the down arrow

Write the 2 in the denominator and press the right arrow

Your equation should now look like this:   y = ½

Now write in the cos and then insert the round brackets ( )

Your equation should now look like this: y = ½ cos (  )

Now write A+B inside the brackets

Press the right arrow to move out of the brackets

Trigonometry Equation Two

To write the trigonometric equation cos 2 = 2cos2 - 1

Open the equation editor

When the box opens write cos2

Insert ø from the Greek characters (lowercase) menu

Now write = 2 2cos to get cos  = 2 cos

To insert ², select the superscript and subscript menu, choose superscript and write 2

Press the right arrow to move away from the superscript

Finish by typing the ø - 1