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In this lesson, we will learn how to find the values of quadrantal angles.
Q1:
Find the value of s e c 1 8 0 ∘ .
Q2:
Two points 𝐴 and 𝐵 lie on the unit circle centered at the origin 𝑂 such that the coordinate of 𝐴 are ( 1 , 0 ) and ∠ 𝐴 𝑂 𝐵 = 𝜋 3 .
Which of the following properties of △ 𝑂 𝐵 𝐴 do you need to use to find the coordinates of point 𝐵 𝜋 3 , 𝜋 3 c o s s i n .
Hence, find c o s 𝜋 3 and s i n 𝜋 3 .
The line 𝑂 𝐵 intersects the line 𝑥 = 1 at 𝑇 ( 1 , 𝑦 ) 𝑇 . The triangle 𝐴 𝑇 𝐶 is formed by reflecting △ 𝑂 𝑇 𝐴 in the line 𝐴 𝑇 . What kind of triangle is the triangle 𝑂 𝑇 𝐶 ?
Find 𝐴 𝑇 𝜋 3 i . e . , t a n .
Q3:
Find the value of c o t 1 8 0 ∘ .
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