Math Chapter Wise question with answer

Q01 If in a triangle ABC, cosA+2cosB+cosC = 2, then a, b, c are in English · PGT 2005 Q02 If in triangle ABC 2cosA cosB 2cosC a b + + = + a b c bc ca then the value of Angle A will be: English · TGT 2011 Q03 In triangle ADC, the value of (b+c)cosA+(c+a) cosB+ (a+b) cosC English · TGT 2011 Q04 2 2 b c cosB cosC − + ∑ ∑ is equal to: English · TGT 2005 Q05 If 2 2 2 A B (cosA cosB) (sinA sinB) sin, 2 then what is the value of λ? English · OAVS TGT 2021 Q06 Let fk (x) = 1 k (sink x + cosk x) for k = 1, 2, 3... Then, for all x∈ R, the value of f4(x) – f6(x) is: English · EMRS PGT-2023