Question

Evaluate:Sec 70 degree sin 20 degree –cos 20 degree cosec 70 degree

Answer 1

Sec(90-20).Sin20/-Cos(90-70).Cosec70 =Cosec20.Sin20/-Sin70.Cosec70 =1/-1 =-1

Answer 2

Answer:

0

Step-by-step explanation:

Given :$sec 70 sin 20 - cos 20 cosec 70$

To Find :  Evaluate

Solution :

$sec 70 sin 20 - cos 20 cosec 70$

$\frac{1}{cos 70} sin (90-70) - cos (90-70) \frac{1}{sin 70}$

$\frac{1}{cos 70} cos 70 - Sin 70 \frac{1}{sin 70}$

$1-1$

0

Hence $sec 70 sin 20 - cos 20 cosec 70$ = 0