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In triangle ABC ,right angled at b ,if tan A 4/4 then the value of cosC is |
| Answer» Given that: In ∆ABC, angle b=90°And tan A =4/4=P/B.Find: Cos C=?By using Pythagoras theorem.AC²=AB²+BC²AC²=(4)²+(4)²AC²=16+16AC²=32AC²=√32AC²=⁴√2.Now we find the value ofCos C= B/H= 4/⁴√2= 1/√2. Done?? | |