NCERT Exercise 3.3 Q10 - Trigonometric Functions
Question: Prove sin((n+1)x)sin((n+2)x)+cos((n+1)x)cos((n+2)x)=cos x.
Answer: The left-hand side is cos x.
Full step-by-step NCERT solution with diagrams on Something by Zero.
Question: Prove sin((n+1)x)sin((n+2)x)+cos((n+1)x)cos((n+2)x)=cos x.
Answer: The left-hand side is cos x.
Full step-by-step NCERT solution with diagrams on Something by Zero.