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Z15 Math
Question 14
2019 April(Z15) Math Question 14
Trigonometry
- Pythagorean Theorem & sin cos tan
Choice H
sin
2
(
θ
)
+
cos
2
(
θ
)
=
1
⇒
sin
2
(
α
)
+
cos
2
(
α
)
=
1
⇒
(
15
17
)
2
+
cos
2
(
α
)
=
1
⇒
225
289
+
cos
2
(
α
)
=
1
⇒
cos
2
(
α
)
=
64
289
⇒
cos
(
α
)
=
64
289
=
8
17
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