A teacher printed 720 copies. How long did it take to print?
1 answer:
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Answer:
B
Step-by-step explanation:
using the identity
sin²x + cos²x = 1 ( subtract 1 from both sides )
sin²x + cos²x - 1 = 0 ( subtract sin²x from both sides )
cos²x - 1 = - sin²x
then
= ← cancel sin²Θ on numerator and denominator
=
= -