Question

any tricks in trigonometry u guys know plz help me out

Answer 1

hi,
There definitely are tricks to memorizing formulas. For example, sin(x+y) has sin and cos paired up and summed, while cos(a+b) has the same trig functions together, but cos minus sin. For x−y

you just flip the signs.

With a little inspection you'll notice the half angle formulas come from the identity cos(2A)=1−2sin2(A)=2cos2(A)−1

. This is just the cos(x+y)

formula and the Pythagorean identity.

I hope these helped, everything's connected and related.

mark as an brainliest answer thanks