(A) Evaluate {5 \cos ^2 60^{\circ}+4 \sec ^2 30^{\circ}-\tan ^2 45^{\circ}}/{ \sin ^2 30^{\circ}+\cos ^2 30^{\circ}} OR (B) If {\A} and {\B} are acute angles such that \sin ( {\A}- {\B})=0 and 2 \cos ( {\A}+ {\B})-1=0, then find angles {\A} and {\B}.

CBSE Class 10 Math 2023 Delhi Set-1 Solved Paper - Question 25

Question : 25 of 38

Marks: +1, -0

(A) Evaluate

\;{5 \cos ^2 60^{∘}+4 \ sec ^2 30^{∘}-\tan ^2 45^{∘}}/{ sin \;^2 30^{∘}+\cos ^2 30^{∘}}

OR
(B) If

{\A}

and

{\B}

are acute angles such that

sin \;( {\A}- {\B})=0

and

2 \cos ( {\A}+ {\B})-1=0

, then find angles

{\A}

and

{\B}

Solution:

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