Question

can you find the period of y=cos(ax)*cos(bx)+sin(ax)*sin(bx) ?

Answer 1

@ganeshie8.please help me

Answer 2

@k142.please help me

Answer 3

@nikato.help!

Answer 4

@campbell_st .

Answer 5

y=cos(ax)*cos(bx)+sin(ax)*sin(bx)
=cos(ax-bx)
=cos((a-b)x)

Answer 6

what do you know about period of cos(Ax) ?

Answer 7

i know that the period of cos(ax) is \[\frac{ 2\pi }{ \left| a \right| }\]

Answer 8

In light of that knowledge,
whats the period of cos((a-b)x) ?

Answer 9

it's \[\frac{ 2\pi }{ a-b }\]

Answer 10

perfect!!