Question

यदि A = 60º तथा B = 30º हो, तो सत्यापित कीजिए :
(i) sin (A + B) ≠ sin A + sin B
(ii) sin (A + B) = sin A .cos B + cos A .sin B
(iii) cos (A – B) = cos A .cos B + sin A .sin B
(iv) cos (A + B) = cos A .cos B – sin A .sin B
(v) tan A = √(1 – cos²A) ÷ cos A

Answer 1

Answer:

(iii)cos(A-B)=cosA.cosB+sinA.sinB

Answer 2

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