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We need to find the value of (cos²67° - sin²23°)
cos²67° - sin²23°
⇒ cos²67° - cos² (90° - 23°) {cos (90° - ∅) = sin ∅}
⇒ cos²67° - cos²67°
⇒0
Answer = 0
cos²67° - sin²23°
⇒ cos²67° - cos² (90° - 23°) {cos (90° - ∅) = sin ∅}
⇒ cos²67° - cos²67°
⇒0
Answer = 0
Answered by
0
the answer is zero....
sin
23 = cos![x^{2} [/tex<br />cos[tex] x^{2}](https://tex.z-dn.net/?f=+x%5E%7B2%7D+%5B%2Ftex%3Cbr+%2F%3Ecos%5Btex%5D+x%5E%7B2%7D+ "x^{2} [/tex<br />cos[tex] x^{2}")
67 - cos67 = 0
cheers..!
sin
cheers..!
Jay1234:
x is 1 here...lol
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