Question

(v) cos² 25° - sin² 65º – tan² 45°​

Answer 1

Answer:

-1

Step-by-step explanation:

please see the attached picture dear

Answer 2

$\huge{\underline{\mathtt{\red{S}\pink{O}\green{L}\blue{U}\purple{T}\orange{I}\pink{O}\red{N ᭄}}}}$

$\sf\bold{cos² 25°- sin² 65º – tan² 45°}$

$\implies\sf\bold{[cos(90^ \circ-65^\circ)] {sin}^{2}65^\circ - {(tan45^\circ)}^{2} }$

$\implies\sf\bold{ {sin}^{2} 65^ \circ - {sin}^{2}65^\circ - {(1)}^{2} }$

$\implies\sf\bold{0 - 1}$

$\implies\sf\bold\purple{ - 1}$