(cos.cos67-sin.sin23)
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[ Cos^2 67° - Sin^2 23°]
= [ Cos^2(90-23°) - sin^2 23°]
= [ Sin^2 23° - Sin^2 23°]
= 0
If you satisfied mark it brainliest.
= [ Cos^2(90-23°) - sin^2 23°]
= [ Sin^2 23° - Sin^2 23°]
= 0
If you satisfied mark it brainliest.
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