2 sin2 a-cos2a=2, find value of a
Answers
Answered by
16
SOLUTION:
Given:
2sin²A -cos²A =2
To find:
The value of a.
Explanation:
2sin²A -cos²A =2
=) 2sin²A -cos²A =2(sin² + cos²A)
=) 2sin²A -cos²A = 2sin²A +2cos²A
=) 3cos² A=0
=) cosA= 0
A= 90°
Thank you.
Answered by
0
Answer:
Step-by-step explanation:
2sin^2 a - cos^2 a= 2
⇒2sin^2 a-cos^2 a= 2(sin^2 a + cos^2 a)
⇒2sin^2 a -cos^2 a= 2sin^2 a + 2cos^2 a
⇒-cos^2 a = 2cos^2 a
⇒3cos^2 a =0
⇒cos^2 a =0
⇒a=90° or a=nπ/2
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