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At x= pi/4 , find the product (sin4x)(cos5x)
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12 votes
At x= pi/4 , find the product (sin4x)(cos5x)

User Ppapapetrou
by
8.1k points

1 Answer

5 votes

Answer:

  • zero

Explanation:

x= π/4

  • sin(4x)*cos(5x) =
  • sin(4*π/4)*cos (5*π/4) =
  • sin(π)*cos(5π/4)

sin(π) = 0, therefore the product is also zero

User Toskv
by
8.1k points
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