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Q01 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 Q02 If 5(tan2 x – cos2 x) = 2cos 2x + 9, then he value of cos 4x is: English · EMRS PGT-2023 Q03 If sin-1 x+sin-1 y= π, 2 then the value of cos-1 x + cos-1 y is English · Bihar (TRE 2.0)-2023 Q04 If π x -, 2 2 ∈ then the value of sin-1 (cosx) is English · Bihar (TRE 2.0)-2023 Q05 If ≤ 1 1 - x 2 2 then the value of sin-1 () 2 2x 1 x − is English · Bihar (TRE 2.0)-2023 Q06 If cos2 A + cos4 A = 1, then the value of the expression sinA + sin2 A is: English · EMRS TGT-2023