Addition Formula Question
I have a problem involving a right angled triangle ABC. It is right angled at C.
The hypoteneuse has a value of 13 units.
A line stretches across the triangle from B to side AC at D. Side AC is divided into AD and DC. DC has the value 4 units.
Angle ABD equals x degrees and angle DBC equals 30 degrees.
I have to find the exact value of sin x.
I have worked out that side BC has a value of 6.928 units. Hypoteneuse BD has a value of 7.9 units and side AD equals 7 units.
Can anyone give me help with this problem please?