Question

√1+sin÷1-sin+√1-sin÷1+sin​

Answer 1

(√1+sin@/1-sin@) + (√1-sin@/1+sin@)

= {(√1+sin@)^2+ (√1-sin@)^2} / (1-sin^2@)

= 2(1+sin^2@) / cos^2@

= 2(-cos^2@) / cos^2@

= -2