Math, asked by keyanoronha, 1 year ago

can someone please help me prove this ​

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Answered by sandy1816
1

Step-by-step explanation:

sin(x+y)sin(x-y)/cos²xcos²y

=sin²xcos²y-cos²xsin²y/cos²xcos²y

=sin²x/cos²x-sin²y/cos²y

=tan²x-tan²y

=sec²x-sec²y

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