Question

Evaluate:cos²25+cos²65-tan²45

Answer 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 ...

Answer 2

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
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I HOPE IT WILL HELP YOU

✌️