sin (25 - a)-cos (65 +a)
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Answered by
1
Answer:
0
Step-by-step explanation:
sin(25-a) - cos(65+a)
= sin [(90-65)-a] - cos(65+a)
= sin[90-(65+a)] - cos(65+a)
= cos(65+a) - cos(65+a)
= 0
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