co-sine means sine of co-mplimentary angle.
so, cos(90-x) = sin(x)
and your function is just -sin(x)
Or, you can apply the difference formula, but that is done before the negative
-[cos(90-x)]
= -[cos90cosx+sin90sinx]
= -sinx
How would I do this:
-cos(90-x)
I know you would use the compound angle formula and I know how to do it but when you have -cos do you replace the cos with the negative?
so for example
-cos90(-cosx) + sinx(sin90)
1 answer