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यदि sin (A + 2B) = √3/2 तथा cos (A+ 4B) = 0 है, जहाँ A तथा B न्यूनकोण हैं, तो A तथा B ज्ञात कीजिए।

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दिया है,

sin(A + 2B) = √3/2,

sin(A + 2B) = sin 60° 

(∴ sin 60° = √3/2)

A + 2B = 60° …(i)

तथा cos(A + 4B) = 0

cos(A + 4B) = cos 90° 

(∵ cos 90° = 0)

A + 4B = 90° …(ii)

समीकरण (i) व (ii) को हल करने पर,

B = 15° तथा A = 30°

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