Question

prove that sin 70 / cos 20 + cosec 20/ sec 70 - 2 cos 70 - cosec 20 = 0 prove it ​

Answer 1

Sin70/cos 20+cosec20/sec70

-2cos70*cosec20

=Sin(90-70)/cos20 + cosec20(90-20)/sec70 - 2 cos70 * cosec (90-20)

=cos20/cos20 + sec 70 / sec 70

-2*cos70*sec70

=1+1-2cos70*1/cos70

=2-2*1

=2-2=0

Hence proved

Answer 2

Refers to attachment ♡~