CBSE Class 11-science Answered
if sinA.secA = -1 and a lies in 2nd quadrant find sinA and secA.
Asked by swati gaur | 31 May, 2013, 12:54: PM
Expert Answer
sinA.secA = -1
sinA/cosA = -1
sinA = -cosA
Now, A lies in second quadrant, hence sinA >0 but, cosA <0 which is also proved through the above equation
Also, |sinA| = |cosA| can be true only if A = pi/4
Hence, the solution of this equation would be A = pi/2 + pi/4 (since A is in second quadrant)
A = 3pi/4
Answered by | 31 May, 2013, 07:37: PM
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