prove that cos (60⁰-30⁰) = cos 60° cos 30⁰+ sin 60 ⁰sin 30⁰
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Answer:
LHS
cos(60 - 30)
= cos(30)
= root 3/2
RHS
cos(60)cos(30)+sin(60)sin(30)
= (1/2)(root 3/2) + (root 3/2)(1/2)
= root 3/4 +root 3/4
= 2 root 3/4 = root 3/2
Step-by-step explanation:
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