help@askiitians.com

+91-735-322-1155

Trigonometry> if cos(x-y) – 3 cos (x+y), then the value...

question mark

if cos(x-y) – 3 cos (x+y), then the value of cotx coty is

laxman , 11 Years ago

Grade 11

1 Answers

Jitender Singh

Last Activity: 11 Years ago

Ans:
Hello Student,
Please find answer to your question below

$cos(x-y) = 3cos(x+y)$
$cosx.cosy+sinx.siny = 3(cosx.cosy-sinx.siny)$
$cosx.cosy+sinx.siny = 3cosx.cosy-3sinx.siny$
$4sinx.siny = 2cosx.cosy$
$\frac{cosx.cosy}{sinx.siny} = 2$
$cotx.coty = 2$

LIVE ONLINE CLASSES

Prepraring for the competition made easy just by live online class.

Full Live Access

Study Material

Live Doubts Solving

Daily Class Assignments

In ABC, if cot A+cot B+cot C = cosecA cosecB cosecC, then prove that ABC is right angle triangle.

trigonometry

1 Answer Available

Last Activity: 3 Years ago

Find the general solution of equation tan3∂=cot2∂
For all angles between -720 and +720

trigonometry

1 Answer Available

Last Activity: 3 Years ago

To prove : Cosec(45 degree - A)Cosec(45 degree + A) = 2SecA

trigonometry

1 Answer Available

Last Activity: 3 Years ago

Derive a formula for the area of the triangle, given b, A, B, and C. That is, derive the formula: (b^2sinAsinC)/(2sinB)

trigonometry

1 Answer Available

Last Activity: 3 Years ago

WHAT IS THE LIMIT WHEN X TOWARDS TO 0 OF sin6x/5x ? lim𝑥→0 𝑠𝑖𝑛6𝑥/5𝑥

trigonometry

1 Answer Available

Last Activity: 3 Years ago

View all Questions