Question

18.
Find value of sin2 15° + cos ² 15​

Answer 1

Answer:

the value is 1from sin2theta +cos2theta

Answer 2

$trigonometric \: identities$

$sin {}^{2} x + cos {}^{2} x = 1$

$sec {}^{2} x - tan {}^{2} x = 1$

$cosec {}^{2} x - cot {}^{2} x = 1$

$similarly$

$sin {}^{2} 15° + cos {}^{2} 15° = 1$