sin^2A cos^2B + cos^2A sin^2B + cos^2A cos^2B + sin^2A sin^2B = 1
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Answer:
Step-by-step explanation:
sin²A cos²B + cos²A sin²B + cos²A cos²B + sin²A sin²B
= cos²B(sin²A + cos²A) + sin²B(cos²A+ sin²A)
= cos²B + sin²B
= 1
= R,H.S
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