Evaluate:cos²25+cos²65-tan²45
Answers
Answered by
1
here is your answer--
✌️✌️ we know that -
cos(90-Q) = sinQ
cos²25+cos²65 -tan²45
so, coS²25 + cos²(90-25) -tan²45
cos²25+sin²25 -tan²45
so, 1- 1
= 0 ANS ...
✌️✌️ we know that -
cos(90-Q) = sinQ
cos²25+cos²65 -tan²45
so, coS²25 + cos²(90-25) -tan²45
cos²25+sin²25 -tan²45
so, 1- 1
= 0 ANS ...
Answered by
33
Hey !!!
Here is your answer
⬇️⬇️⬇️⬇️⬇️⬇️⬇️⬇️
As we know ..
Sin²θ + Cos²θ = 1
So ,
Cos²25 = 1 - Sin²25
Or
Cosθ = Sin(90 - θ)
So ,
Cos²65 = Sin²(90 - 65) = sin²25
And.......
tan45 = 1
So ,
tan²45 = 1²
So ,
= Cos²25 + Cos²65 - tan²45
= 1 - sin²25 + sin²25 - 1
= 0
___________________
I HOPE IT WILL HELP YOU
✌️
Here is your answer
⬇️⬇️⬇️⬇️⬇️⬇️⬇️⬇️
As we know ..
Sin²θ + Cos²θ = 1
So ,
Cos²25 = 1 - Sin²25
Or
Cosθ = Sin(90 - θ)
So ,
Cos²65 = Sin²(90 - 65) = sin²25
And.......
tan45 = 1
So ,
tan²45 = 1²
So ,
= Cos²25 + Cos²65 - tan²45
= 1 - sin²25 + sin²25 - 1
= 0
___________________
I HOPE IT WILL HELP YOU
✌️
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