cos (45° + A) –cos (45°– A)/sin (120° +A) – sin (120°–A) = root
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cos(45+A)−cos(45−A)
=
2cos(120)sinA
−2sin(45)sinA
=
2
2
=
2
........[sin45=
2
1
,cos(120)=−
2
1
]
Formula Used [cosu−cosv=−2sin(
2
u+v
)sin(
2
u−v
), sinu−sinv=2cos(
2
u+v
)sin(
2
u−v
)]
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