given cos15degree =√3+1/2√2 is it true that cos (45degree-30degree)=cos45degree cos30degree+sin45degreesin30degree
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Answer:
Yes, it is true that cos(45°-30°) = cos45°cos30°+sin45°sin30°
Step-by-step explanation:
Given: cos15° =
Consider, cos(45°-30°) = cos45°cos30°+sin45°sin30°
⇒ cos(45°-30°) = ×+×
⇒ cos15° =
Hence Proved
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