Question

please dolve its urgent......​

Answer 1

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$\large{\boxed{\blue{\star\:Note}}}$

• Cos(A+B) = CosACosB - SinASinB

Here , Given ,

• A = 30°
• B= 60°

CosACosB - SinASinB = ?

• CosACosB - SinASinB = Cos(A+B)
• CosACosB - SinAsinB = Cos(30°+60°) = Cos90°
• Cos90° = 0

Hope it helps

#Jai_hindh

Answer 2

Answer:

cosA.cosB-sinA sinB

cos30.cos60-sin30.sin60

root3/2.1/2-1/2.root3/2.1/2

root3/4-root3/4=0