Question

if it is right to say that cos 60 + 30 = cos 60 + cos 30- sin 60 × sin 30​

Answer 1

Answer:

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Step-by-step explanation:

Answer 2

According to your question cos 60 + cos 30- sin 60 × sin 30​ this is not correct but the real formula is cos60×cos30 - sin60×sin30 which is 1/2×√3/2 - √3/2×1/2=√3/4 - √3/4 = 0 and cos (60+30)=cos 90 = 0 so it is correct to say