## britbrat4290 Complete the identity.. 7 months ago 7 months ago

1. britbrat4290

2. Coolsector

so sin(a+b) = sinacosb + cosbsina can you do it now ?

3. britbrat4290

what is the value of that b sign ?

4. Coolsector

a - alpha , b - beta

5. britbrat4290

its not on my calc .. confused by that one

6. Coolsector

$\sin(\alpha\ + \beta\ )= \sin(\alpha\ )\cos(\beta\ ) + \sin(\beta\ )\cos(\alpha\ )$

7. Coolsector

this is an identity.. can you solve your problem using this now ?

8. britbrat4290

tan α + tan β .... or do i have those reverse ?

9. Coolsector

correct