if cos (A -B) = COSA.COSB + sinA.sinB. Find the value of cos 15. plzz frndzzz help me fast ... urgent...
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Answer: √6/4+√2/4
Step-by-step explanation:
Cow 15
Cos(45-30) => cos45. Cos30+ sin45. Sin30
=>1/√2. √3/2 +1/√2. 1/2
=>√3/2√2 + 1/2√2
=> √3+1/2√2 × √2/√2
=> √6/4 +√2/4
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