Easy method to find if cosA=2/5,find the value of 4+4 tan square A
gaurav390:
you can find the answer by taking 4 common and using property 1+ tan2=sec2
cos is nothing but 1/sec
thank you
sir gaurav
hece the answer is 5
please follow me if you like my method
ans is 25 not 5
sorry
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We have,
CosA=2/5
Now,
4+4tan^2 A = 4(1 + tan^2 A)
=4(sec^2 A)
=4(1/cos^2A)
=4*1/(4/25)
= 25
CosA=2/5
Now,
4+4tan^2 A = 4(1 + tan^2 A)
=4(sec^2 A)
=4(1/cos^2A)
=4*1/(4/25)
= 25
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