Question

what is the value of cos²31degree-sin²59degree​

Answer 1

Step-by-step explanation:

sin^2(31°)-cos^2(59°)

= sin^2 (31°)-cos^2 (90°-31°)

=sin^2 (31°)-sin^2 (31°)

=0

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Answer 2

Answer:

your question should be  cos² 39 - sin²51​

Step-by-step explanation:

=>  cos²(39) - sin²(51)

=>  cos²(39) - sin²(90 - 51)

=>  cos²(39) - cos²(39)

=>  0