Question

without using the trigonometric tables find the value of x if cos x = cos 60 degree cos 30 degree + sin 60 degree sin 30 degree​

Answer 1

Answer:

cosx=cos60  

∘

cos30  

∘

+sin60  

∘

sin30  

∘

 

cosx=cos(60  

∘

−30  

∘

)

cosx=cos30  

∘

 

x=30  

∘

Step-by-step explanation:

Answer 2

Answer:

cosx=cos60 ∘ cos30 ∘+sin60 ∘ sin30 ∘

cosx=cos(60 ∘−30 ∘)

cosx=cos30 ∘

x=30 ∘

Step-by-step explanation:

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