given that cos (A-B) = cos A cos B + sin A sinB , find the value of 15*
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we can write cos 15* as,
cos (45-30) and apply identity.
cos (45-30) - cos 45.cos 30 + sin 45. sin 30
= 1/√2 × √3/2 + 1/√2 × 1/2
= √3/2√2 + 1/2√2
= √3+1/2√2.
I hope you understand.
please mark brainliest.
plzz
cos (45-30) and apply identity.
cos (45-30) - cos 45.cos 30 + sin 45. sin 30
= 1/√2 × √3/2 + 1/√2 × 1/2
= √3/2√2 + 1/2√2
= √3+1/2√2.
I hope you understand.
please mark brainliest.
plzz
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