find sin 2A and Cos 2A if sin a is equal to 4 by 5
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sin 2A=2sinAcosA
cos 2A=2cos^2A--1
= 2sinAcosA
= 2×4/5×3/5
= 24/25
= 2cos^2A--1
= 2×(3/5)^2--1
= 2×9/25--1
=2×9--25/25
=--32/25
cos 2A=2cos^2A--1
= 2sinAcosA
= 2×4/5×3/5
= 24/25
= 2cos^2A--1
= 2×(3/5)^2--1
= 2×9/25--1
=2×9--25/25
=--32/25
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