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NDA · Maths · Trigonometric Identities
NDA Trigonometric Identities — Formulas 2
Question
1
of 12
1.
Which is the correct expansion of cos(A ± B)?
A
cos
(
A
±
B
)
=
cos
A
cos
B
±
sin
A
sin
B
\cos(A\pm B)=\cos A\cos B\pm\sin A\sin B
cos
(
A
±
B
)
=
cos
A
cos
B
±
sin
A
sin
B
B
cos
(
A
±
B
)
=
cos
A
cos
B
∓
sin
A
sin
B
\cos(A\pm B)=\cos A\cos B\mp\sin A\sin B
cos
(
A
±
B
)
=
cos
A
cos
B
∓
sin
A
sin
B
C
cos
(
A
±
B
)
=
sin
A
cos
B
∓
cos
A
sin
B
\cos(A\pm B)=\sin A\cos B\mp\cos A\sin B
cos
(
A
±
B
)
=
sin
A
cos
B
∓
cos
A
sin
B
D
cos
(
A
±
B
)
=
cos
A
sin
B
∓
sin
A
cos
B
\cos(A\pm B)=\cos A\sin B\mp\sin A\cos B
cos
(
A
±
B
)
=
cos
A
sin
B
∓
sin
A
cos
B
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