A, B দুটা সূক্ষ্মকোণ, আৰু A+ B <90°. দেখুওৱা যে।
cos (A+B) cos (A-B) = cos? A-sin? B ।
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Answer:
A+B=90°
A-B=90°
_______
2A=180°
A=90°
A-B=90°
90°-90°=B
B=0°
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