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Mathematics
Will Waters
8 February, 12:41
If tan²A = 1 + 2tan²B
Show: COS2B = 1+2 cos2A
+1
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Erick Bennett
8 February, 15:03
0
Step-by-step explanation:
hello:
here is this idea:
tanA = sinA/cosA tanB = sinB/cosB
cos²A+sin²A = 1 cos²B+sin²B = 1
cos²A-sin²A=cos2A cos²B-sin²B=cos2B
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