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OPP
ADJ
HYP
θ
In Y9 we learned that
Sin θ = OPPHYP
Cos θ
Tan θ
=
=
ADJHYP
OPPADJ
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OPP
ADJ
HYP
θ
In Y9 we learned that
Sin θ = OPPHYP
Cos θ
Tan θ
=
=
ADJHYP
OPPADJ
But why not
= OPP
HYP
=
=
ADJ
HYP
OPPADJ
The Six Trigonometric Identities
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5
6
Are there any asymptotes?
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Example 1
Use your calculator to find the value of
(a) sec 100o
(b) cot (4π/3)
Example 2Without using your calculator, are the following positive or negative?
-5.76
0.577
a) sec 280o
b) cot 115o
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Example 3 Without using a calculator, work out the exact values of:
a) cot 135o
b) cot (4π/3)
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Classwork and Homework
Ex 6A Q1, 2, 3
Ex 6B Q3, 6, 8
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