Question

cos square 25 - sin square 65 -tan square 45​

Answer 1

Answer:

cos25=cos(90-65)=sin65

cos square 25-sin square 65- tan square 45

sin square 65-sin square 65-tan square 45

-tan square 45=-(1)^2=-1

Answer 2

Given:

$cos^{2}25 - sin^{2}65-tan^{2}45$

To Find:

Find the value of $cos^{2}25 - sin^{2}65-tan^{2}45$.

Solution:

Please have a look at the attached image.