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Please answer my question I qull mark u brilliant ​

Answer»

Hiii,so, we can write the formula as 2acos THETA /2 -----------------------------------------------------now, if theta =0 ,than 2acos0/2 =2acos 0° =2A because cos0°=1 -------------------------------------------------------------if theta =60° 2acos60/2 =2acos30° =2a×√3/2 =√3a ---------------------------------------------------------------if theta=90° 2acos90/2 =2acos45° =2a×1/√2 =√2a -----------------------------------------------------------------if theta=120 2acos120/2 =2acos60° =2a×1/2 =a. ------------------------------------------------------------------ if theta= 180 =2acos180/2 =2acos90° = 0 because cos90°= 0& if we multiply any number by 0 than the RESULT will be 0 #hope it will help you#mark me brainliest



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