(b) sec80 - 1
tan80
sec40 - 1 tan20
(c) tano + 2tano + 4 tan40 + Scot80 = co
(d) sin'a-cos'a.cos2B = sin - cos*B.cos2
tel V2+12+12 + 200580 = 2000
(0
sin'a - sin
=tan (a + B)
sina.cosa - sinB.cos
vedantal Excel In Opt. Mathematics - Book 10sin 4 theta + sin 4 theta equals to 1 by 4 bracket 3 + cos 4 theta
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