Question

Sin (3 beata )=cos (beata -7) can u all say this prblm

Answer 1

Cos (90-3x) = cos (x-7)
90-3x=x-7
4x=97
X=24.25

Answer 2

Hey there !!!!

sin(3β)=cos(β-7)-----Equation 1

We know that sinx=cos(90-x)

Similarly sin3β=cos(90-3β)

So,equation 1 changes to 

cos(90-3β)=cos(β-7)-----Equation 2

But when cosA=cosB

       ⇒⇒⇒⇒ A=B

So,equation 2 changes to 


cos(90-3β)=cos(β-7)


(90-3β)=(β-7)

90+7=β+3β

4β=97

β=97/4=24.25°

Hope this helped you........