Question

8) Find the value of sin2 60o-cos2 60o.

Answer 1

Answer:

Explanation:

sin260°+cos260°=(23

​​)2+(21​)2

⇒43​+41​=44​=1

∴sin245°+cos245°=(2

​1​)2+(2

​1​)2=21​+21​=1

∴sin260°+cos260°=sin245°+cos245°

Hence, the answer is sin245°+cos245°.

Answer 2

Answer:

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