If sin 2A= cos 4A, find A, tan3A and sin2 2A +cos2 2A
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Step-by-step explanation:
sin 2A= cos 4A
cos (90-2A)= cos 4A
90-2A= 4A
90= 6A
15 = A
hence A=15
tan 3A
tan 45= 1
sin²2A+cos²2A
sin²30+cos²30
(1/2)²+(√3/2)²
1/4+3/4
4/4
1
#666
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