Cos (90 +x) x tan(540 +x) x cos(180 - x) + sin(-90)
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Answer:
apply reduction formula and complement angles of sin and cos
=
cos
x
.
(
−
cos
x
)
+
sin
x
cos
x
.
cos
x
.
(
−
sin
x
)
=
−
cos
2
x
−
sin
2
x
, then use square identity
=
−
1
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