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Hi there! Have questions about your homework? At Brainly, there are 60 million students who want to help each other learn. Questions are usually answered in less than 10 minutes. Try it for yourself by posting a question! :D

Here you can use the transitive property that if a=b and b=c the a=c so just like that if cos A= cos B the A=B because after the putting the values of a and b in co u get the equal answer the it means that a and b are the numbers

In traingle ABC, As both angle A and angle B are acute, only angle C can be 90 degree (since all calculations in trigonometry are done with a right angled triangle. Given, cos A = cos B or, AC/AB = CB/AB or, AC = CB Therefore, Angle A = Angle B(Proved)