Question

.. cos(A+B) = cosAcosB - sinA sinB
Results:
NT
1) cos
-0.
= sin 0
2
Proof: We know that
.. sin(A
cos(x-y) = cosx cosy+sinx siny
TT
Put x =
y=0
y=0 we get
7T
TC
COS
COS
cos 0 + sin sin e
Theore!
2
sin
= 0.cose + 1.sino
= sino
Theore
T
.. cos
- sin e
2
tan (A
Simillarly
Proof​

Answer 1

Answer:

yes it is the right answer

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