Question

please give me 10 class very hard math problem please​

Answer 1

Question 1: If ∠A and ∠B are acute angles such that cos A = cos B, then show that ∠ A = ∠ B.

Question 2: Show that :

(i) tan 48° tan 23° tan 42° tan 67° = 1

(ii) cos 38° cos 52° – sin 38° sin 52° = 0

Question 3: Evaluate 2 tan2 45° + cos2 30° – sin2 60°.

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