Question

sec 70° x sin 20° - cos 20° x cosec 70° Evaluate it.​

Answer 1

Step-by-step explanation:

$\sec(90 - \alpha ) = \csc( \alpha ) \\ \csc(90 - \alpha ) = \sec( \alpha ) \\ \sin( \alpha ) = \frac{1}{ \csc( \alpha ) } \\ \cos( \alpha ) = \frac{1}{ \sec( \alpha ) }$

now put all above value in question

1-1= 0

Answer 2

Answer:

0

Step-by-step explanation:

Given,

= sec 70° * sin 20° - cos 20° * cosec 70°

= sec (90°-20°) * sin 20° - cos(90°-70°) * cosec 70°

= cosec20° * sin20° - sin70° * cosec70°

= 1-1

= 0