Trigonometry
SAT Math · Flashcards
SAT MATH · FLASHCARDS
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QUESTION
Identify the cofunction identity for sine.
QUESTION
Identify the reciprocal of tangent.
QUESTION
Find
cos
(
60
o
)
\text{cos}(60^\text{o})
cos
(
6
0
o
)
using cofunction identity.
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ANSWER
sin
(
30
o
)
=
1
2
\text{sin}(30^\text{o}) = \frac{1}{2}
sin
(
3
0
o
)
=
2
1
. Using
cos
(
90
°
−
30
°
)
=
sin
30
°
\cos(90° - 30°) = \sin 30°
cos
(
90°
−
30°
)
=
sin
30°
.
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