Question

Trig
find the exact value of the expressions cos(a+B), sin(a+B) and tan(a+B) under the following conditions:
sin(a)=(40/41), a lies in quadrant I, and sin(B)=(24/25), B lies in quadrant II.

1. cos(a+B)=

2. sin(a+B)=

3. tan(a+B)=

Answer 1

40/41
or 40 pi/41 ?

Answer 2

40/41

Answer 3

¯\_(ツ)_/¯

Answer 4

You need to use trig identities.

Answer 5

\[\sin(a+b) = \sin(a)\cos(b)+\sin(b)\cos(a)\]