Grade 12th passTrigonometry
If sin(A+B)=cos(A-B) then which of the following is true1.sin2A=12.tanA=13.cos2A=14.1&2Co
1 Answer
Arun
Approved Tutor Answer8 Years agoDear Raju
sinA cosB + cosA sinB = cosA cosB + sinA sinB
sinA (cosB - sinB ) = cosA ( cosB - sinB)
Hence
SinA = cosA
Hence tan A = 1
A = 45°
Hence sin 2A = 1
Hence option 4 is correct because
sin 2A = 1
&
tan A = 1
Regards
Arun (askIITians forum expert)
Other Related Questions on trigonometry
In ABC, if cot A+cot B+cot C = cosecA cosecB cosecC, then prove that ABC is right angle triangle.
In ABC, if cot A+cot B+cot C = cosecA cosecB cosecC, then prove that ABC is right angle triangle.
trigonometry
Last Activity: 3 Years ago
- Find the general solution of equation tan3∂=cot2∂
For all angles between -720 and +720
- Find the general solution of equation tan3∂=cot2∂
For all angles between -720 and +720
trigonometry
Last Activity: 4 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)
Derive a formula for the area of the triangle, given b, A, B, and C. That is, derive the formula: (b^2sinAsinC)/(2sinB)
trigonometry
Last Activity: 4 Years ago
WHAT IS THE LIMIT WHEN X TOWARDS TO 0 OF sin6x/5x ? lim𝑥→0 𝑠𝑖𝑛6𝑥/5𝑥
WHAT IS THE LIMIT WHEN X TOWARDS TO 0 OF sin6x/5x ? lim𝑥→0 𝑠𝑖𝑛6𝑥/5𝑥
trigonometry
Last Activity: 4 Years ago