Answer:23
Step-by-step explanation:
Answer: 70
90+20=110
180-110=70
I hope this is good enough:
Answer:
2
sin²a + cos²a + sec²a - tan²a
sin²a + cos²a = 1
1 + tan²a = sec²a
So, sec²a - tan²a = 1
= 1 + 1 = 2