There are 67 toy animals in the store. Then the clerk sells 19 toy animals. How many toy animals are in the store now? Describe
2 answers:
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Answer:
cos x ≠ 0 ⇔ x ≠ ; k ∈ N
<=> cos²x + sin²x = 1
⇔ 1 = 1
=> x = { R \ (pi/2 + k.pi); k ∈ N}
Step-by-step explanation: