Question

if 2sin x+ 3sin y = 5,then cos x +3 cos y =?​

Answer 1

Answer:

0

Step-by-step explanation:

Ghis is conceptual question.let's think about maximum value of sinx and siny

you know,as well maximum value of sin function is 1 { because-1<= sin<=1}

so maximum value of sinx=1

and also maximum value of siny=1

now 2sinx+3siny=2×1+3×1=5

it means 2sinx+3siny=5 only when sinx is 1and siny is 1

or π/2and y=π/2

now

cosx +3cosy

=cos(π/2)+3cos (π/2)

=0+3×0

0

hence,the valie of cosx+3cosy=0

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