If cosA=2/5, find the value of 4 +4tan²A

1.	If cosA=2/5, find the value of 4 +4tan²A
Answer» First of all u have to find ( Perpedicular) by pythagoras theorem. Value of P is root21. Then 4 + 4×(root21/2)^24+ 4×( 21/4)4+2125 Ans 25

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