Question

1 + cos2A = 3cos AsinA হলে cotA-র মান নির্ণয় করাে।​

Answer 1

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Step-by-step explanation:

ANSWER ::

1 + cos2A = 3cos AsinA

2cos² A = 3sinAcosA

2cos² A - 3sinAcosA = 0

2cosA ( cosA - 3sinA) = 0

Then Cos A= 0 or cosA - 3 SinA = 0

Now Cos A= 0 gives Cot A = Cos A / SinA = 0

Again

cosA - 3 SinA = 0 gives

cosA = 3 SinA

CotA = 3