find the value of cos²45-sin²15
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Answer:
2√3/8
Step-by-step explanation:
cos 45 =1/√2
sin 15= ✓3 -1 /2√2
ans= 1/2 - (√3-1)^2 /(2√2)^2
= 1/2 - (4-2√3)/8
= (4-4+2√3)/8
= 2√3/8
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