The sum and difference identity cos(x + y) / sin(x - y) = 1 - cotxcoty / cotx - coty is verified
<u>Solution:</u>
Given expression is:
Let us first solve L.H.S
------ EQN 1
We have to use the sum and difference formulas
cos(A + B) = cosAcosB – sinAsinB
sin(A - B) = sinAcosB – cosAsinB
Applying this in eqn 1 we get,
Taking -1 as common from numerator and denominator we get,
= R.H.S
Thus L.H.S = R.H.S
Thus the given expression has been verified using sum and difference identity
The awnser for this is 9 I think it sure
Answer:
r=-8
Step-by-step explanation:
-15 = 2r + 1. we know 2r has to be -16 because -16 + 1 = -15. -16 / 2 = -8
the answer would be -1 hope this helps