cos x tan x - 2 cos^2 = -1
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Step-by-step explanation:
:
Reminders
∣
∣
∣
∣
∣
¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
a
a
tan
x
=
sin
x
cos
x
a
a
∣
∣
∣
−−−−−−−−−−−−−−−−−
and
∣
∣
∣
∣
¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
a
a
sin
(
−
x
)
=
−
sin
x
a
a
∣
∣
−−−−−−−−−−−−−−−−−−−−−−
⇒
tan
(
−
x
)
cos
(
−
x
)
=
sin
(
−
x
)
cos
(
−
x
)
×
cos
(
−
x
)
=
sin
(
−
x
)
=
−
sin
x
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