Question

find the value of (05² 67°- sin²23°) ​

Answer 1

Answer:

sin2 23°= cos°(90°- sin)

Step-by-step explanation:

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Answer 2

Step-by-step explanation:

cos^2 67° - sin^2 23°

cos^2 67° - sin^2(90-67)

cos^2 67° -cos^2 67

[by using identity sin(90-A ) = cos(A) ]

= 0