if sinA = cosA, find the value of 2tan(sq)A + sin(sq)A - 1

Asked by Harshit Agarwal | 21st Sep, 2013, 09:18: AM

Expert Answer:

Given sinA = cosA
We know that sin 45 = cos45 = 1/ root2
Hence, A = 45 degrees
 
Therefore,
2tan2A + sin2A - 1
= 2tan245o + sin245o - 1
= 2(1) + (1/2) - 1
= 1 + 1/2
= 3/2

Answered by  | 22nd Sep, 2013, 03:57: PM

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