Question

please answer this question ​

Answer 1

HELLO MATE !!

Let theta= a for typing convenience.

sin a tan a/ 1-cos a

Multiplying numerator and denominator by cos a

sin a* sin a/cos a* cos a / cos a(1-cos a)

=sin²a/ cos a(1- cos a)

= 1-cos²a/cos a(1-cos a)

= (1+cos a)(1-cos a)/cos a(1-cos a)

= 1+cos a/cos a

= 1+sec a------------------------proved