Deriving the Triangle Area Formula
Precalculus · Flashcards · Recall
PRECALCULUS · FLASHCARDS
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QUESTION
State the reciprocal identity for
sec
(
θ
)
\sec(\theta)
sec
(
θ
)
in terms of
cos
(
θ
)
\cos(\theta)
cos
(
θ
)
.
QUESTION
State the reciprocal identity for
csc
(
θ
)
\csc(\theta)
csc
(
θ
)
in terms of
sin
(
θ
)
\sin(\theta)
sin
(
θ
)
.
QUESTION
What is the complementary-angle relationship between sine and cosine in a right triangle?
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ANSWER
sin
(
θ
)
=
cos
(
90
∘
−
θ
)
\sin(\theta)=\cos(90^\circ-\theta)
sin
(
θ
)
=
cos
(
9
0
∘
−
θ
)
. Sine and cosine of complementary angles are equal.
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