2. Which of the following statements are correct? (a) If z = 1+ 0i = x € R, then the definitions of sin z and cos z agree with the usual definitions for real variables. (b) cos z and sin z are 27 periodic. (c) cos² z + sin² z = 1 (d) cos z and sin z are injective functions from C to C

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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[Complex Analysis] Which statement(s) are correct?

2.
Which of the following statements are correct?
(a) If z = 1+ 0i = x € R, then the definitions of sin z and cos z agree
with the usual definitions for real variables.
(b) cos z and sin z are 27 periodic.
(c) cos² z + sin² z = 1
(d) cos z and sin z are injective functions from C to C
Transcribed Image Text:2. Which of the following statements are correct? (a) If z = 1+ 0i = x € R, then the definitions of sin z and cos z agree with the usual definitions for real variables. (b) cos z and sin z are 27 periodic. (c) cos² z + sin² z = 1 (d) cos z and sin z are injective functions from C to C
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