What is the value of (cos2 67° – sin2 23°)?
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Answer:
What is the value of (cos2 67° – sin2 23°)?
Step-by-step explanation:
(cos^2 ( 90-23) - sin^2 23)
sin^2 23 - sin^23 (cos(90-theta) = sin theta0
0
sonabrainly:
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=cos^2 67 - cos^2 (90-67)
=cos^2 67 - cos^2 67
=0
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