if tan A = root 2-1, then Sin A cos A= root 2/4
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tan a=√2-1
tan square a =sec square a-1
sec square a=√2-1 +1
sec square a=√2
cos square a=1/√2
sin square a= 1- 1/√2
sin square a=√2-1/√2
sin a. cos a= √2/4
tan square a =sec square a-1
sec square a=√2-1 +1
sec square a=√2
cos square a=1/√2
sin square a= 1- 1/√2
sin square a=√2-1/√2
sin a. cos a= √2/4
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