Uh guys i just wanna confirm the answer to this - If cos A = 2/5, find the value of 4 + 4 tan2 A.
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by Pythagoras
ab2=bc2+ac2
5square=bc2+2square
25=bc2+4
25-4=bc2
√21=bc
4+4tan2a
4+4*(√21/2)2
4+4*21/4
4+84/4
taking lcm
16+84÷4
100/4
25
I hope it's correct
ab2=bc2+ac2
5square=bc2+2square
25=bc2+4
25-4=bc2
√21=bc
4+4tan2a
4+4*(√21/2)2
4+4*21/4
4+84/4
taking lcm
16+84÷4
100/4
25
I hope it's correct
purvaihere:
Yes! I got the same one. Thanks a looooooooooot! :]
no problem
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