Question
Find the trigonometric functions of : 90°
✓
Answer
Angle of measure 90° :
Let m∠XOA = 90°
Its terminal arm (ray OA)
intersects the standard, unit circle at P(0, 1).
$\therefore x=0 \text { and } y=1$
$\sin 90^{\circ}=y=1$
$\cos 90^{\circ}=x=0$
$\tan 90^{\circ}=\frac{y}{x}=\frac{1}{0}, \text { which is not defined }$
$\operatorname{cosec} 90^{\circ}=\frac{1}{y}=\frac{1}{1}=1$
$\sec 90^{\circ}=\frac{1}{x}=\frac{1}{0}, \text { which is not defined }$
$\cot 90^{\circ}=\frac{x}{y}=\frac{0}{1}=0$
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