find the value of cos²45-sin²15
Share
Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
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
brainliest answer