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Grade: 11


Help me plz.....m stuck in this question.....kindly explain 37 and 38

one year ago

Answers : (2)

25211 Points
Dear student
Please ask only one question in one thread,
tan 3x – tan 2x = 1 + tan 2x tan3x
hence tan 3x – tan2x /(1 + tan 2x tan3x) = 1
tan (3x – 2x) = 1
tan x = 1
hence x = pi/4 and 5 pi/4
but 2x = pi/2 and 5pi/2
hence no solution
one year ago
Ravi Sankar Mukhrejee
18 Points
37.2sec 2α=tan β+cot β
=>2(1/cos 2α)=(sin β/cos β)+(cos β/sin β)[∵sec x=1/cos x;tan x=sin x/cos x;cot x=cos x/sin x]
=>2(1/cos 2α)=(sin²β+cos²β)/sin β•cos β
=>(1/cos 2α)=1/2sin β•cos β[∵sinx+cos²x=1]
=>cos 2α=2sin β•cos β
=>cos 2α=sin 2β[∵2sin x•cos x=sin 2x]
=>cos 2α=cos(π/2-2β)[∵sin x=cos(90°-x)]
one year ago
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