If cos B = 2/5 , find the value of 4+4 tanB
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heya friends.
CosB=2/5=b/h. ..{consider as b is base h is heipotenous and p is perpendicular of right angle triangle }
so ....
by using Pythagoras theorem
p²=√h²-b²
p=√5²-2²
p=√21
and ...as you know that.
tanB=p/b=√21/2
and ...now putting this value on
4+4tanB
=4+4*√21/2
=4+2√21
=2{2+√2q} Ans.
hope it helps you
@Rajukumar
CosB=2/5=b/h. ..{consider as b is base h is heipotenous and p is perpendicular of right angle triangle }
so ....
by using Pythagoras theorem
p²=√h²-b²
p=√5²-2²
p=√21
and ...as you know that.
tanB=p/b=√21/2
and ...now putting this value on
4+4tanB
=4+4*√21/2
=4+2√21
=2{2+√2q} Ans.
hope it helps you
@Rajukumar
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