Question

What is the value of 5sin75°sin77°+2cos13°cos15° /cos15°sin77°-7sin81°/cos9°

Answer 1

Answer:

0(zero)

Step-by-step explanation:

5sin75°sin77°+2cos13°cos15°/cos15°sin77°-7sin81°/cos9°

=5sin(90°-15°)sin77°+2cos(90°-77°)cos15°/cos15°sin77°-7sin(90°-9°)/cos9°

=5cos15°sin77°+2sin77°cos15°/cos15°sin77°-7cos9°/cos9°

=7cos15°sin77°/cos15°sin77°- 7

=7-7

=0

Answer 2

Answer:

5sin75°sin77°+2cos13°cos15°/cos15°sin77°-7sin81°/cos9°

=5sin(90°-15°)sin77°+2cos(90°-77°)cos15°/cos15°sin77°-7sin(90°-9°)/cos9°

=5cos15°sin77°+2sin77°cos15°/cos15°sin77°-7cos9°/cos9°

=7cos15°sin77°/cos15°sin77°- 7

=7-7

=0

Step-by-step explanation:

5sin75°sin77°+2cos13°cos15°/cos15°sin77°-7sin81°/cos9°

=5sin(90°-15°)sin77°+2cos(90°-77°)cos15°/cos15°sin77°-7sin(90°-9°)/cos9°

=5cos15°sin77°+2sin77°cos15°/cos15°sin77°-7cos9°/cos9°

=7cos15°sin77°/cos15°sin77°- 7

=7-7

=0