6. If cos A =2/5 , find the value of 4 + 4 tan^2A
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cos A=2/5
cos A=base/hypotaneus
hypotaneus^2=height^2+base^2
5^2=height^2+2^2
25=height^2+4
25-4=height^2
√21=height
tanA=height/base
=√21/2
4+4tan^2
=4+4*√21/2
=4+2√2
cos A=base/hypotaneus
hypotaneus^2=height^2+base^2
5^2=height^2+2^2
25=height^2+4
25-4=height^2
√21=height
tanA=height/base
=√21/2
4+4tan^2
=4+4*√21/2
=4+2√2
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