I think its.......5/15=1/3
Answer:
s
Step-by-step explanation:
Since that angle all together is 180, 100 is 2z-10 and z is 55
B is your answer. Hope this helps :)
Seca(1-sina)(seca+tana)=1
Left hand side
=(1-sina) (seca +tana) / cosa
=seca +tana - sinaseca - sinatan / cosa
=seca + tana -tana -(sin^2a/cosa) / cosa
=(1/cosa - sin^2a/cosa) / cosa
= (1-sin^2a / cosa) / cosa
= (1-sin^2a)/ (cos^2a)
=1 (verified)
