cos2(45+theta)+cos2(45-theta) / tan(60+theta)tan(30+theta)
Kindly, refer to the below link for similar query,
https://www.meritnation.com/ask-answer/question/cos2-45-a-cos2-45-a-tan-60-a-tan-30-a/introduction-to-trigonometry/10545889
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https://www.meritnation.com/ask-answer/question/cos2-45-a-cos2-45-a-tan-60-a-tan-30-a/introduction-to-trigonometry/10545889
Regards.