find the value of:
cos^2 20° + cos^2 70°÷
sin^2 59° + sin^2 31°
Answers
Answered by
1
We can say cos^ 20 = cos^ (90-70)
Cos^2 20 = sin^2 70
As sin^2 31 = cos^2 59
And we know that sin^2 a + cos^2 a = 1 so
1/1 = 1 ans
Cos^2 20 = sin^2 70
As sin^2 31 = cos^2 59
And we know that sin^2 a + cos^2 a = 1 so
1/1 = 1 ans
Answered by
1
Answer:
It's trigonometry
Cos^2(90°-20°)+Cos^2(20) °÷Sin^2(90°-31°)+Sin^2(31°)
Both the terms will be cancelled
Therefore value of this=1
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