A point on the unit circle has –coordinate and

MATHEMATICS · Subjective · A Level · Mathematics · Trigonometry · Trigonometry

Problem

A point

P(x, y)

on the unit circle has

x

–coordinate

x=-\dfrac{7}{25}

and

y>0

. (i) Find

y

. (ii) Using the same angle

\theta

that corresponds to

P

, verify numerically that

1+\tan^2\theta=\sec^2\theta