Question

How to solve this:
sin^2 100 + tan^2 100 + cos ^2 100 + 1 is equal to

a) 1
b) sec^2 100 + 1
c) sec ^2 100
d) undefined

Answer 1

group 1st and 3rd terms

Answer 2

sin^2 100 + tan^2 100 + cos ^2 100 + 1
-------- ----------

Answer 3

you need to remember below identity :
sin^2A + cos^2A = 1

Answer 4

I got it, thank you very much

Answer 5

np :)