Question

If 12 tan A=15 then cos A=​

Answer 1

Step-by-step explanation:

12 tanA =15 then cos A =???

given Tan A = 15/12

sin A/cos A=15 / 12

√ 1 - cos² theta/cos theta=15/12

1-cos² theta/co² theta=225/144

144-144cos² theta=225 cos²

144=369cos² theta

cos theta=±√369/√144

cos theta=±6√11/12

cos theta=±√11/2

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