Prove that- cos 35 -A-cos 35 -B-sin 35 -A-sin 35 -B -cosA-B

LHS=cos( 35 ^∘ #160; +A)cos( 35 ^∘ #160; B)+sin( 35 ^∘ #160; +A)sin( 35 ^∘ #160; B)=cos (35^∘+A 35^∘+B) =cos(A+B)=RHS ...

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Domain and Range of Basic Inverse Trigonometric Functions

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Question

Prove that: $c o s (35^{\circ} + A) . c o s (35^{\circ} - B) + s i n (35^{\circ} + A) . s i n (35^{\circ} - B) = c o s (A + B)$

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